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CMS RVU26D · Effective 2026-10-01

88364 in Redding

Office / nonfacility

$136.57

Base rate per service

Facility setting

Not available in this setting

Base rate per service

Amounts below use the non-QP conversion factor for participating physicians. These are base physician payments before claim-level adjustments, not patient costs or total hospital charges.

Surgical pathology

About 88364: Additional in situ hybridization probe stain

Reports an additional single-probe in situ hybridization stain on a specimen after the initial probe procedure, such as an additional FISH probe.

This code covers an additional single-probe in situ hybridization stain procedure on a specimen after its initial probe stain. A pathology laboratory performs the probe-based testing on tissue or other submitted material, and a pathologist interprets the findings as part of the diagnostic workup. Fluorescence in situ hybridization (FISH) is a familiar example; the additional stain may assess another target on the specimen.

Report the code only with an eligible primary procedure, such as the initial single-probe stain, and count each additional probe stain procedure per specimen. The record should identify the specimen, the additional probe or target, and the testing performed. Medicare treats this as an add-on paid within the primary procedure’s global period. The global service is billed without a component modifier; modifier 26 reports the interpretation, while modifier TC reports the technical work, equipment, and staff. Both modifiers are separately priced under the CMS facts.

CMS billing rules for 88364

Global period
Add-on code: billed only together with a primary procedure and paid within that procedure's global period.
Professional and technical components
Diagnostic test with a professional component (modifier 26, interpretation) and a technical component (modifier TC, equipment and staff); billing without a modifier is the global service.

Where the value comes from

  • Work RVU0.68 · 18%
  • Practice expense (office) RVU3.09 · 82%
  • Malpractice RVU0.02 · 1%

47.5K

Medicare services in 2024 · #800 by national volume

This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.

88364 compared with similar codes

Office rates for Redding, from the same CMS release.

88365

In situ hybridization

Manual probe stain

$182.40

88365 represents the initial single-probe stain on a specimen. Use 88364 for an additional single-probe stain procedure.

88366

FISH interpretation

Interpretation and report

$286.72

88366 reports interpretation and a report for in situ hybridization; 88364 represents the additional probe stain procedure itself.

88367

ISH analysis

Automated morphometric analysis

$112.70

88367 reports manual morphometric analysis of in situ hybridization findings, rather than an additional probe stain procedure.

88368

ISH analysis

Manual, initial probe

$157.14

88368 reports computer-assisted morphometric analysis; 88364 reports an additional single-probe stain procedure.

The same code, a different location

How does Redding compare?

In Bakersfield, the office rate for 88364 is $136.67—$0.10 higher than the $136.57 rate in Redding. Both use the same code, release and participation basis.

88364 across payment areas

Same release and payment basis · bars start at $0

  1. Redding · This locality

    $136.57

  2. Bakersfield

    $136.67

    $0.10 higher than Redding

  3. Chico

    $136.57

    The same base rate than Redding

  4. El Centro

    $136.58

    $0.01 higher than Redding

  5. Fresno

    $136.57

    The same base rate than Redding

  6. Hanford-Corcoran

    $136.57

    The same base rate than Redding

  7. Los Angeles-Long Beach-Anaheim (Los Angeles/Orange Cnty)

    $146.18

    $9.61 higher than Redding

Other payment areas listed in California appear first, followed by selected cross-country examples. The chart compares amounts, not distance.

Across 109 of 109 CMS payment localities with a supported office rate, 88364 ranges from $111.71 in Arkansas to $174.40 in San Jose-Sunnyvale-Santa Clara (San Benito Cnty). This is a geographic range, not an average.

The code’s RVUs stay the same in these comparisons. Geographic adjustments to work, practice expense and malpractice change the dollar amount. A city name alone may not identify the payment area for a service address.

Compare all 108 other payment areas

  • Madera

    California · 88364

    Office

    $136.57

    Facility

    Unavailable

    The same base rate than Redding for the office setting.

  • Merced

    California · 88364

    Office

    $136.57

    Facility

    Unavailable

    The same base rate than Redding for the office setting.

  • Modesto

    California · 88364

    Office

    $136.57

    Facility

    Unavailable

    The same base rate than Redding for the office setting.

  • Napa

    California · 88364

    Office

    $160.51

    Facility

    Unavailable

    $23.94 higher than Redding for the office setting.

  • Oxnard-Thousand Oaks-Ventura

    California · 88364

    Office

    $145.76

    Facility

    Unavailable

    $9.19 higher than Redding for the office setting.

  • Rest Of California

    California · 88364

    Office

    $136.57

    Facility

    Unavailable

    The same base rate than Redding for the office setting.

  • Riverside-San Bernardino-Ontario

    California · 88364

    Office

    $136.81

    Facility

    Unavailable

    $0.24 higher than Redding for the office setting.

  • Sacramento-Roseville-Folsom

    California · 88364

    Office

    $143.92

    Facility

    Unavailable

    $7.35 higher than Redding for the office setting.

  • Salinas

    California · 88364

    Office

    $143.39

    Facility

    Unavailable

    $6.82 higher than Redding for the office setting.

  • San Diego-Chula Vista-Carlsbad

    California · 88364

    Office

    $147.19

    Facility

    Unavailable

    $10.62 higher than Redding for the office setting.

  • San Francisco-Oakland-Berkeley (Marin Cnty)

    California · 88364

    Office

    $170.70

    Facility

    Unavailable

    $34.13 higher than Redding for the office setting.

  • San Francisco-Oakland-Berkeley (San Francisco/San Mateo/Alameda/Contra Costa Cnty)

    California · 88364

    Office

    $170.68

    Facility

    Unavailable

    $34.11 higher than Redding for the office setting.

  • San Jose-Sunnyvale-Santa Clara (San Benito Cnty)

    California · 88364

    Office

    $174.40

    Facility

    Unavailable

    $37.83 higher than Redding for the office setting.

  • San Jose-Sunnyvale-Santa Clara (Santa Clara Cnty)

    California · 88364

    Office

    $174.30

    Facility

    Unavailable

    $37.73 higher than Redding for the office setting.

  • San Luis Obispo-Paso Robles

    California · 88364

    Office

    $141.01

    Facility

    Unavailable

    $4.44 higher than Redding for the office setting.

  • Santa Cruz-Watsonville

    California · 88364

    Office

    $148.95

    Facility

    Unavailable

    $12.38 higher than Redding for the office setting.

  • Santa Maria-Santa Barbara

    California · 88364

    Office

    $144.05

    Facility

    Unavailable

    $7.48 higher than Redding for the office setting.

  • Santa Rosa-Petaluma

    California · 88364

    Office

    $150.49

    Facility

    Unavailable

    $13.92 higher than Redding for the office setting.

  • Stockton

    California · 88364

    Office

    $136.57

    Facility

    Unavailable

    The same base rate than Redding for the office setting.

  • Vallejo

    California · 88364

    Office

    $160.48

    Facility

    Unavailable

    $23.91 higher than Redding for the office setting.

  • Visalia

    California · 88364

    Office

    $136.57

    Facility

    Unavailable

    The same base rate than Redding for the office setting.

  • Yuba City

    California · 88364

    Office

    $136.57

    Facility

    Unavailable

    The same base rate than Redding for the office setting.

  • Dc + Md/Va Suburbs

    District of Columbia · 88364

    Office

    $146.26

    Facility

    Unavailable

    $9.69 higher than Redding for the office setting.

  • Miami

    Florida · 88364

    Office

    $131.84

    Facility

    Unavailable

    $4.73 lower than Redding for the office setting.

  • Chicago

    Illinois · 88364

    Office

    $128.13

    Facility

    Unavailable

    $8.44 lower than Redding for the office setting.

  • Manhattan

    New York · 88364

    Office

    $145.15

    Facility

    Unavailable

    $8.58 higher than Redding for the office setting.

  • Alaska*

    Alaska · 88364

    Office

    $144.35

    Facility

    Unavailable

    $7.78 higher than Redding for the office setting.

  • Alabama

    Alabama · 88364

    Office

    $113.40

    Facility

    Unavailable

    $23.17 lower than Redding for the office setting.

  • Arkansas

    Arkansas · 88364

    Office

    $111.71

    Facility

    Unavailable

    $24.86 lower than Redding for the office setting.

  • Arizona

    Arizona · 88364

    Office

    $123.29

    Facility

    Unavailable

    $13.28 lower than Redding for the office setting.

  • Colorado

    Colorado · 88364

    Office

    $133.32

    Facility

    Unavailable

    $3.25 lower than Redding for the office setting.

  • Connecticut

    Connecticut · 88364

    Office

    $135.13

    Facility

    Unavailable

    $1.44 lower than Redding for the office setting.

  • Delaware

    Delaware · 88364

    Office

    $125.40

    Facility

    Unavailable

    $11.17 lower than Redding for the office setting.

  • Fort Lauderdale

    Florida · 88364

    Office

    $128.47

    Facility

    Unavailable

    $8.10 lower than Redding for the office setting.

  • Rest Of Florida

    Florida · 88364

    Office

    $122.38

    Facility

    Unavailable

    $14.19 lower than Redding for the office setting.

  • Atlanta

    Georgia · 88364

    Office

    $128.44

    Facility

    Unavailable

    $8.13 lower than Redding for the office setting.

  • Rest Of Georgia

    Georgia · 88364

    Office

    $115.57

    Facility

    Unavailable

    $21.00 lower than Redding for the office setting.

  • Hawaii, Guam

    Hawaii · 88364

    Office

    $140.45

    Facility

    Unavailable

    $3.88 higher than Redding for the office setting.

  • Iowa

    Iowa · 88364

    Office

    $117.41

    Facility

    Unavailable

    $19.16 lower than Redding for the office setting.

  • Idaho

    Idaho · 88364

    Office

    $117.98

    Facility

    Unavailable

    $18.59 lower than Redding for the office setting.

  • East St. Louis

    Illinois · 88364

    Office

    $119.01

    Facility

    Unavailable

    $17.56 lower than Redding for the office setting.

  • Rest Of Illinois

    Illinois · 88364

    Office

    $117.99

    Facility

    Unavailable

    $18.58 lower than Redding for the office setting.

  • Suburban Chicago

    Illinois · 88364

    Office

    $130.05

    Facility

    Unavailable

    $6.52 lower than Redding for the office setting.

  • Indiana

    Indiana · 88364

    Office

    $118.71

    Facility

    Unavailable

    $17.86 lower than Redding for the office setting.

  • Kansas

    Kansas · 88364

    Office

    $116.35

    Facility

    Unavailable

    $20.22 lower than Redding for the office setting.

  • Kentucky

    Kentucky · 88364

    Office

    $115.08

    Facility

    Unavailable

    $21.49 lower than Redding for the office setting.

  • New Orleans

    Louisiana · 88364

    Office

    $120.59

    Facility

    Unavailable

    $15.98 lower than Redding for the office setting.

  • Rest Of Louisiana

    Louisiana · 88364

    Office

    $114.69

    Facility

    Unavailable

    $21.88 lower than Redding for the office setting.

  • Metropolitan Boston

    Massachusetts · 88364

    Office

    $147.47

    Facility

    Unavailable

    $10.90 higher than Redding for the office setting.

  • Rest Of Massachusetts

    Massachusetts · 88364

    Office

    $132.29

    Facility

    Unavailable

    $4.28 lower than Redding for the office setting.

  • Baltimore/Surr. Cntys

    Maryland · 88364

    Office

    $134.65

    Facility

    Unavailable

    $1.92 lower than Redding for the office setting.

  • Rest Of Maryland

    Maryland · 88364

    Office

    $128.00

    Facility

    Unavailable

    $8.57 lower than Redding for the office setting.

  • Rest Of Maine

    Maine · 88364

    Office

    $118.08

    Facility

    Unavailable

    $18.49 lower than Redding for the office setting.

  • Southern Maine

    Maine · 88364

    Office

    $125.41

    Facility

    Unavailable

    $11.16 lower than Redding for the office setting.

  • Detroit

    Michigan · 88364

    Office

    $123.44

    Facility

    Unavailable

    $13.13 lower than Redding for the office setting.

  • Rest Of Michigan

    Michigan · 88364

    Office

    $117.70

    Facility

    Unavailable

    $18.87 lower than Redding for the office setting.

  • Minnesota

    Minnesota · 88364

    Office

    $129.11

    Facility

    Unavailable

    $7.46 lower than Redding for the office setting.

  • Metropolitan Kansas City

    Missouri · 88364

    Office

    $120.28

    Facility

    Unavailable

    $16.29 lower than Redding for the office setting.

  • Metropolitan St. Louis

    Missouri · 88364

    Office

    $121.64

    Facility

    Unavailable

    $14.93 lower than Redding for the office setting.

  • Rest Of Missouri

    Missouri · 88364

    Office

    $112.33

    Facility

    Unavailable

    $24.24 lower than Redding for the office setting.

  • Mississippi

    Mississippi · 88364

    Office

    $112.07

    Facility

    Unavailable

    $24.50 lower than Redding for the office setting.

  • Montana**

    Montana · 88364

    Office

    $126.59

    Facility

    Unavailable

    $9.98 lower than Redding for the office setting.

  • North Carolina

    North Carolina · 88364

    Office

    $119.43

    Facility

    Unavailable

    $17.14 lower than Redding for the office setting.

  • North Dakota**

    North Dakota · 88364

    Office

    $126.19

    Facility

    Unavailable

    $10.38 lower than Redding for the office setting.

  • Nebraska

    Nebraska · 88364

    Office

    $118.23

    Facility

    Unavailable

    $18.34 lower than Redding for the office setting.

  • New Hampshire

    New Hampshire · 88364

    Office

    $130.74

    Facility

    Unavailable

    $5.83 lower than Redding for the office setting.

  • Northern Nj

    New Jersey · 88364

    Office

    $144.58

    Facility

    Unavailable

    $8.01 higher than Redding for the office setting.

  • Rest Of New Jersey

    New Jersey · 88364

    Office

    $137.06

    Facility

    Unavailable

    $0.49 higher than Redding for the office setting.

  • New Mexico

    New Mexico · 88364

    Office

    $118.16

    Facility

    Unavailable

    $18.41 lower than Redding for the office setting.

  • Nevada**

    Nevada · 88364

    Office

    $126.58

    Facility

    Unavailable

    $9.99 lower than Redding for the office setting.

  • Nyc Suburbs/Long Island

    New York · 88364

    Office

    $148.12

    Facility

    Unavailable

    $11.55 higher than Redding for the office setting.

  • Poughkpsie/N Nyc Suburbs

    New York · 88364

    Office

    $137.56

    Facility

    Unavailable

    $0.99 higher than Redding for the office setting.

  • Queens

    New York · 88364

    Office

    $147.12

    Facility

    Unavailable

    $10.55 higher than Redding for the office setting.

  • Rest Of New York

    New York · 88364

    Office

    $121.23

    Facility

    Unavailable

    $15.34 lower than Redding for the office setting.

  • Ohio

    Ohio · 88364

    Office

    $117.62

    Facility

    Unavailable

    $18.95 lower than Redding for the office setting.

  • Oklahoma

    Oklahoma · 88364

    Office

    $115.40

    Facility

    Unavailable

    $21.17 lower than Redding for the office setting.

  • Portland

    Oregon · 88364

    Office

    $138.24

    Facility

    Unavailable

    $1.67 higher than Redding for the office setting.

  • Rest Of Oregon

    Oregon · 88364

    Office

    $125.98

    Facility

    Unavailable

    $10.59 lower than Redding for the office setting.

  • Metropolitan Philadelphia

    Pennsylvania · 88364

    Office

    $131.36

    Facility

    Unavailable

    $5.21 lower than Redding for the office setting.

  • Rest Of Pennsylvania

    Pennsylvania · 88364

    Office

    $118.09

    Facility

    Unavailable

    $18.48 lower than Redding for the office setting.

  • Puerto Rico

    Puerto Rico · 88364

    Office

    $127.71

    Facility

    Unavailable

    $8.86 lower than Redding for the office setting.

  • Rhode Island

    Rhode Island · 88364

    Office

    $130.35

    Facility

    Unavailable

    $6.22 lower than Redding for the office setting.

  • South Carolina

    South Carolina · 88364

    Office

    $118.65

    Facility

    Unavailable

    $17.92 lower than Redding for the office setting.

  • South Dakota**

    South Dakota · 88364

    Office

    $126.15

    Facility

    Unavailable

    $10.42 lower than Redding for the office setting.

  • Tennessee

    Tennessee · 88364

    Office

    $116.89

    Facility

    Unavailable

    $19.68 lower than Redding for the office setting.

  • Austin

    Texas · 88364

    Office

    $132.54

    Facility

    Unavailable

    $4.03 lower than Redding for the office setting.

  • Beaumont

    Texas · 88364

    Office

    $117.25

    Facility

    Unavailable

    $19.32 lower than Redding for the office setting.

  • Brazoria

    Texas · 88364

    Office

    $125.70

    Facility

    Unavailable

    $10.87 lower than Redding for the office setting.

  • Dallas

    Texas · 88364

    Office

    $126.29

    Facility

    Unavailable

    $10.28 lower than Redding for the office setting.

  • Fort Worth

    Texas · 88364

    Office

    $125.26

    Facility

    Unavailable

    $11.31 lower than Redding for the office setting.

  • Galveston

    Texas · 88364

    Office

    $125.93

    Facility

    Unavailable

    $10.64 lower than Redding for the office setting.

  • Houston

    Texas · 88364

    Office

    $126.30

    Facility

    Unavailable

    $10.27 lower than Redding for the office setting.

  • Rest Of Texas

    Texas · 88364

    Office

    $121.26

    Facility

    Unavailable

    $15.31 lower than Redding for the office setting.

  • Utah

    Utah · 88364

    Office

    $120.33

    Facility

    Unavailable

    $16.24 lower than Redding for the office setting.

  • Virginia

    Virginia · 88364

    Office

    $124.64

    Facility

    Unavailable

    $11.93 lower than Redding for the office setting.

  • Virgin Islands

    United States Virgin Islands · 88364

    Office

    $127.71

    Facility

    Unavailable

    $8.86 lower than Redding for the office setting.

  • Vermont

    Vermont · 88364

    Office

    $125.23

    Facility

    Unavailable

    $11.34 lower than Redding for the office setting.

  • Rest Of Washington

    Washington · 88364

    Office

    $132.20

    Facility

    Unavailable

    $4.37 lower than Redding for the office setting.

  • Seattle (King Cnty)

    Washington · 88364

    Office

    $151.03

    Facility

    Unavailable

    $14.46 higher than Redding for the office setting.

  • Wisconsin

    Wisconsin · 88364

    Office

    $121.79

    Facility

    Unavailable

    $14.78 lower than Redding for the office setting.

  • West Virginia

    West Virginia · 88364

    Office

    $113.36

    Facility

    Unavailable

    $23.21 lower than Redding for the office setting.

  • Wyoming**

    Wyoming · 88364

    Office

    $126.42

    Facility

    Unavailable

    $10.15 lower than Redding for the office setting.

See how rates vary across the country

88364 · Office / nonfacility · Non-QP. Choose a state to explore its payment localities. A range means the amount varies within that state.

MEWIVTNHMTNDMNMINYMARIWAIDWYSDIAILINOHPANJCTORNVUTCONEMOKYWVVAMDDECAAZNMKSOKARTNNCSCDCTXLAMSALGAFLAKHI

Explore a state

Local rates. Clear comparisons.

Hover or focus a tile to see its rate range. Select it to open the state’s fee schedule.

$111.71

$155.49

Color shows the midpoint of each state’s locality range.

View all state and territory rates as a table
State / territoryRate rangeLocalities
AK$144.351
AL$113.401
AR$111.711
AZ$123.291
CA$136.57–$174.4029
CO$133.321
CT$135.131
DC$146.261
DE$125.401
FL$122.38–$131.843
GA$115.57–$128.442
GU$140.451
HI$140.451
IA$117.411
ID$117.981
IL$117.99–$130.054
IN$118.711
KS$116.351
KY$115.081
LA$114.69–$120.592
MA$132.29–$147.472
MD$128.00–$146.263
ME$118.08–$125.412
MI$117.70–$123.442
MN$129.111
MO$112.33–$121.643
MS$112.071
MT$126.591
NC$119.431
ND$126.191
NE$118.231
NH$130.741
NJ$137.06–$144.582
NM$118.161
NV$126.581
NY$121.23–$148.125
OH$117.621
OK$115.401
OR$125.98–$138.242
PA$118.09–$131.362
PR$127.711
RI$130.351
SC$118.651
SD$126.151
TN$116.891
TX$117.25–$132.548
UT$120.331
VA$124.64–$146.262
VI$127.711
VT$125.231
WA$132.20–$151.032
WI$121.791
WV$113.361
WY$126.421

Explore 88364 on the national rate map →

Where does this rate apply?

Redding is a Medicare payment area. Our Census mapping connects it to 32 cities and communities in California, including the examples shown here.

Some communities span more than one payment area. Follow a city link to compare all of its mapped areas, or check the service-location ZIP above for an address-level starting point.

Browse all communities in California →

Use this rate

What is a percentage of Medicare worth?

Turn a percentage into dollars for 88364 in Redding. This uses the base rate on this page, so the locality and release stay consistent.

Reference amount per service

$150.23

$136.57 × 110% = $150.23

A contract may specify another Medicare year or additional adjustments. This is percentage arithmetic on the displayed base rate, not a claim adjudication.

Working with a whole code list?

Compare an offer across your annual code mix, including an older Medicare schedule or flat per-code rates.

Compare your contract offer →

How this local rate is calculated

Each RVU component is multiplied by its own geographic practice cost index (GPCI). The three adjusted components are added, then multiplied by the conversion factor. These are the inputs used for 88364 in Redding.

PPRRVU2026_Oct_nonQPP.csv

11,285

Code
88364
Physician work
0.68
Practice expense
3.09
Malpractice
0.02

GPCI2026.csv

19

Locality
Redding
Physician work
1.017
Practice expense
1.096
Malpractice
0.536
Office / nonfacility calculation for 88364 in Redding
ComponentRVULocality factorAdjusted
Physician work0.68× 1.0170.6916
Practice expense3.09× 1.0963.3866
Malpractice0.02× 0.5360.0107
Total RVUs4.0889
Conversion factor× 33.4009

Office / nonfacility rate, Redding$136.57

Values as parsed from CMS release RVU26D, effective 2026-10-01. The amount is rounded to the nearest cent only at the end.

Open 88364 in the RVU calculator →

Explore RVUs, geographic factors and the full formula

Office / nonfacility

Office / nonfacility calculation inputs
ComponentRVULocal GPCI
Work0.681.017
Practice expense3.091.096
Malpractice0.020.536

(0.68 × 1.017 + 3.09 × 1.096 + 0.02 × 0.536) × $33.4009 = $136.57

The office and facility calculations use their respective practice-expense RVUs. The facility amount here is the physician fee, not a separate hospital or facility bill.

How this rate has changed

88364 · Office / nonfacility

$136.57

Effective 2026-10-01

The base rate is $1.88 higher than on 2025-10-01, moving from $134.69 to $136.57 (1.4%).

It is unchanged from the immediately preceding available release, effective 2026-07-01.

Base rate by release · bars start at $0 · select a bar to compare

One bar per available release, ordered by effective date. Missing rates remain gaps. These comparisons hold the code, setting and locality identifiers constant; they do not isolate which policy or input caused a change.

What changed, release by release

  1. January 1, 2026

    RVU26A

    $134.69changed to$136.57

    • Conversion factor 32.3465 changed to 33.4009
    • Work RVU 0.70 changed to 0.68
    • Practice expense RVU 3.15 changed to 3.09
    • Work GPCI 1.014 changed to 1.017
    • Practice expense GPCI 1.093 changed to 1.096
    • Malpractice GPCI 0.560 changed to 0.536

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    Earliest loaded release: $134.69

    Held through RVU25B, RVU25C, RVU25D.

Explore release dates and calculate this code in an earlier period →

Each row uses the accepted CMS release effective on that date and the same contractor and locality identifiers. Missing rates stay visible. Historical boundaries may differ; verify the service address for an older claim.

Inspect every release and its CMS source
Effective fromOffice / nonfacilityFacilityCMS release
2026-10-01$136.57Not available in this settingRVU26D
2026-07-01$136.57Not available in this settingRVU26C
2026-04-01$136.57Not available in this settingRVU26B
2026-01-01$136.57Not available in this settingRVU26A
2025-10-01$134.69Not available in this settingRVU25D
2025-07-01$134.69Not available in this settingRVU25C
2025-04-01$134.69Not available in this settingRVU25B
2025-01-01$134.69Not available in this settingRVU25A

88364 billing questions

When is this code used instead of the initial-probe code?

Use it for each additional single-probe stain procedure on a specimen after the initial probe procedure. The initial stain is reported with 88365.

Can this code be billed by itself?

No. It is an add-on code and must be reported with an eligible primary procedure, such as the initial probe stain.

How are units counted?

Count each additional single-probe stain procedure per specimen. Document the specimen and the additional probe or target tested.

When should modifier 26 or TC be used?

Use modifier 26 for the professional interpretation or TC for the technical work, equipment, and staff. Without either modifier, the claim represents the global service.

What documentation supports an additional-probe claim?

The record should show which specimen received testing, the additional probe or target, and that the service was an additional stain procedure beyond the initial probe.

Where these rates come from

FeeBase calculates base physician payments from CMS work, practice-expense, and malpractice RVUs, adjusted by each locality’s geographic indices and the applicable conversion factor. Unavailable or separately priced services are labeled rather than assigned a made-up amount.

Source: RVU26D. Effective 2026-10-01 through the day before 2027-01-01.

RVUs for 88364PPRRVU2026_Oct_nonQPP.csv, line 11,285 (RVU26D)
Geographic factors for ReddingGPCI2026.csv, line 19 (RVU26D)
Open CMS sourceHow this rate is calculatedBuild a fee sheet