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CMS RVU26D · Effective 2026-10-01

Q4166 in Chico

Office / nonfacility

$139.47

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.

Wound care supply

About Q4166: Cytal wound matrix supply

Reports Cytal extracellular matrix material used on a wound bed, measured by area and billed with the related wound application procedure.

Cytal is an extracellular matrix wound product derived from porcine urinary bladder tissue. A wound-care clinician may apply it to a prepared wound bed, including in the treatment of chronic wounds such as diabetic foot or venous leg ulcers. The product amount is reported by the square centimeter, rather than by the number of wounds or a time increment.

Report Q4166 with the primary wound application procedure for the same treatment, using documentation that identifies Cytal, the treated wound site, and the quantity applied in square centimeters. CMS classifies this as an add-on code: it must be billed with a primary procedure and is paid within that procedure's global period. CMS also identifies it as technical-component-only, with interpretation covered by a separate code rather than this line. The application service and the Cytal material are distinct reported items.

CMS billing rules for Q4166

Global period
Add-on code: billed only together with a primary procedure and paid within that procedure's global period.
Professional and technical components
Technical-component-only code: a separate code covers interpretation.

Where the value comes from

  • Work RVU0.00 · 0%
  • Practice expense (office) RVU3.81 · 100%
  • Malpractice RVU0.00 · 0%

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.

Q4166 compared with similar codes

Office rates for Chico, from the same CMS release.

Q4165

Wound matrix

Per square centimeter

$139.47

Q4165 identifies Keramatrix or Kerasorb. Q4166 is specific to Cytal; select according to the product actually furnished.

Q4167

Wound product

TruSkin, per square centimeter

$139.47

Q4167 identifies TruSkin, not Cytal. Both are area-based wound product codes, but the product determines which code applies.

15271

Skin substitute graft

First 25 cm², trunk/limbs

$165.37

15271 reports the wound application service for qualifying trunk or extremity sites. Q4166 reports the Cytal material and must accompany a primary procedure.

The same code, a different location

How does Chico compare?

In Bakersfield, the office rate for Q4166 is $139.47—the same base rate than the $139.47 rate in Chico. Both use the same code, release and participation basis.

Q4166 across payment areas

Same release and payment basis · bars start at $0

  1. Chico · This locality

    $139.47

  2. Bakersfield

    $139.47

    The same base rate than Chico

  3. El Centro

    $139.47

    The same base rate than Chico

  4. Fresno

    $139.47

    The same base rate than Chico

  5. Hanford-Corcoran

    $139.47

    The same base rate than Chico

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

    $150.55

    $11.08 higher than Chico

  7. Madera

    $139.47

    The same base rate than Chico

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, Q4166 ranges from $109.31 in Arkansas to $183.51 in San Jose-Sunnyvale-Santa Clara (Santa Clara 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

  • Merced

    California · Q4166

    Office

    $139.47

    Facility

    Unavailable

    The same base rate than Chico for the office setting.

  • Modesto

    California · Q4166

    Office

    $139.47

    Facility

    Unavailable

    The same base rate than Chico for the office setting.

  • Napa

    California · Q4166

    Office

    $167.73

    Facility

    Unavailable

    $28.26 higher than Chico for the office setting.

  • Oxnard-Thousand Oaks-Ventura

    California · Q4166

    Office

    $150.42

    Facility

    Unavailable

    $10.95 higher than Chico for the office setting.

  • Redding

    California · Q4166

    Office

    $139.47

    Facility

    Unavailable

    The same base rate than Chico for the office setting.

  • Rest Of California

    California · Q4166

    Office

    $139.47

    Facility

    Unavailable

    The same base rate than Chico for the office setting.

  • Riverside-San Bernardino-Ontario

    California · Q4166

    Office

    $139.47

    Facility

    Unavailable

    The same base rate than Chico for the office setting.

  • Sacramento-Roseville-Folsom

    California · Q4166

    Office

    $148.00

    Facility

    Unavailable

    $8.53 higher than Chico for the office setting.

  • Salinas

    California · Q4166

    Office

    $147.49

    Facility

    Unavailable

    $8.02 higher than Chico for the office setting.

  • San Diego-Chula Vista-Carlsbad

    California · Q4166

    Office

    $152.20

    Facility

    Unavailable

    $12.73 higher than Chico for the office setting.

  • San Francisco-Oakland-Berkeley (Marin Cnty)

    California · Q4166

    Office

    $179.43

    Facility

    Unavailable

    $39.96 higher than Chico for the office setting.

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

    California · Q4166

    Office

    $179.43

    Facility

    Unavailable

    $39.96 higher than Chico for the office setting.

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

    California · Q4166

    Office

    $183.51

    Facility

    Unavailable

    $44.04 higher than Chico for the office setting.

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

    California · Q4166

    Office

    $183.51

    Facility

    Unavailable

    $44.04 higher than Chico for the office setting.

  • San Luis Obispo-Paso Robles

    California · Q4166

    Office

    $144.95

    Facility

    Unavailable

    $5.48 higher than Chico for the office setting.

  • Santa Cruz-Watsonville

    California · Q4166

    Office

    $154.62

    Facility

    Unavailable

    $15.15 higher than Chico for the office setting.

  • Santa Maria-Santa Barbara

    California · Q4166

    Office

    $148.38

    Facility

    Unavailable

    $8.91 higher than Chico for the office setting.

  • Santa Rosa-Petaluma

    California · Q4166

    Office

    $156.27

    Facility

    Unavailable

    $16.80 higher than Chico for the office setting.

  • Stockton

    California · Q4166

    Office

    $139.47

    Facility

    Unavailable

    The same base rate than Chico for the office setting.

  • Vallejo

    California · Q4166

    Office

    $167.73

    Facility

    Unavailable

    $28.26 higher than Chico for the office setting.

  • Visalia

    California · Q4166

    Office

    $139.47

    Facility

    Unavailable

    The same base rate than Chico for the office setting.

  • Yuba City

    California · Q4166

    Office

    $139.47

    Facility

    Unavailable

    The same base rate than Chico for the office setting.

  • Dc + Md/Va Suburbs

    District of Columbia · Q4166

    Office

    $149.91

    Facility

    Unavailable

    $10.44 higher than Chico for the office setting.

  • Miami

    Florida · Q4166

    Office

    $132.47

    Facility

    Unavailable

    $7.00 lower than Chico for the office setting.

  • Chicago

    Illinois · Q4166

    Office

    $127.89

    Facility

    Unavailable

    $11.58 lower than Chico for the office setting.

  • Manhattan

    New York · Q4166

    Office

    $147.87

    Facility

    Unavailable

    $8.40 higher than Chico for the office setting.

  • Alaska*

    Alaska · Q4166

    Office

    $135.53

    Facility

    Unavailable

    $3.94 lower than Chico for the office setting.

  • Alabama

    Alabama · Q4166

    Office

    $111.35

    Facility

    Unavailable

    $28.12 lower than Chico for the office setting.

  • Arkansas

    Arkansas · Q4166

    Office

    $109.31

    Facility

    Unavailable

    $30.16 lower than Chico for the office setting.

  • Arizona

    Arizona · Q4166

    Office

    $123.31

    Facility

    Unavailable

    $16.16 lower than Chico for the office setting.

  • Colorado

    Colorado · Q4166

    Office

    $135.40

    Facility

    Unavailable

    $4.07 lower than Chico for the office setting.

  • Connecticut

    Connecticut · Q4166

    Office

    $137.06

    Facility

    Unavailable

    $2.41 lower than Chico for the office setting.

  • Delaware

    Delaware · Q4166

    Office

    $125.73

    Facility

    Unavailable

    $13.74 lower than Chico for the office setting.

  • Fort Lauderdale

    Florida · Q4166

    Office

    $128.91

    Facility

    Unavailable

    $10.56 lower than Chico for the office setting.

  • Rest Of Florida

    Florida · Q4166

    Office

    $121.66

    Facility

    Unavailable

    $17.81 lower than Chico for the office setting.

  • Atlanta

    Georgia · Q4166

    Office

    $129.29

    Facility

    Unavailable

    $10.18 lower than Chico for the office setting.

  • Rest Of Georgia

    Georgia · Q4166

    Office

    $113.51

    Facility

    Unavailable

    $25.96 lower than Chico for the office setting.

  • Hawaii, Guam

    Hawaii · Q4166

    Office

    $144.69

    Facility

    Unavailable

    $5.22 higher than Chico for the office setting.

  • Iowa

    Iowa · Q4166

    Office

    $116.44

    Facility

    Unavailable

    $23.03 lower than Chico for the office setting.

  • Idaho

    Idaho · Q4166

    Office

    $117.08

    Facility

    Unavailable

    $22.39 lower than Chico for the office setting.

  • East St. Louis

    Illinois · Q4166

    Office

    $117.08

    Facility

    Unavailable

    $22.39 lower than Chico for the office setting.

  • Rest Of Illinois

    Illinois · Q4166

    Office

    $116.19

    Facility

    Unavailable

    $23.28 lower than Chico for the office setting.

  • Suburban Chicago

    Illinois · Q4166

    Office

    $130.69

    Facility

    Unavailable

    $8.78 lower than Chico for the office setting.

  • Indiana

    Indiana · Q4166

    Office

    $117.97

    Facility

    Unavailable

    $21.50 lower than Chico for the office setting.

  • Kansas

    Kansas · Q4166

    Office

    $115.04

    Facility

    Unavailable

    $24.43 lower than Chico for the office setting.

  • Kentucky

    Kentucky · Q4166

    Office

    $113.13

    Facility

    Unavailable

    $26.34 lower than Chico for the office setting.

  • New Orleans

    Louisiana · Q4166

    Office

    $119.75

    Facility

    Unavailable

    $19.72 lower than Chico for the office setting.

  • Rest Of Louisiana

    Louisiana · Q4166

    Office

    $112.62

    Facility

    Unavailable

    $26.85 lower than Chico for the office setting.

  • Metropolitan Boston

    Massachusetts · Q4166

    Office

    $151.95

    Facility

    Unavailable

    $12.48 higher than Chico for the office setting.

  • Rest Of Massachusetts

    Massachusetts · Q4166

    Office

    $134.00

    Facility

    Unavailable

    $5.47 lower than Chico for the office setting.

  • Baltimore/Surr. Cntys

    Maryland · Q4166

    Office

    $136.55

    Facility

    Unavailable

    $2.92 lower than Chico for the office setting.

  • Rest Of Maryland

    Maryland · Q4166

    Office

    $128.78

    Facility

    Unavailable

    $10.69 lower than Chico for the office setting.

  • Rest Of Maine

    Maine · Q4166

    Office

    $117.08

    Facility

    Unavailable

    $22.39 lower than Chico for the office setting.

  • Southern Maine

    Maine · Q4166

    Office

    $126.11

    Facility

    Unavailable

    $13.36 lower than Chico for the office setting.

  • Detroit

    Michigan · Q4166

    Office

    $122.80

    Facility

    Unavailable

    $16.67 lower than Chico for the office setting.

  • Rest Of Michigan

    Michigan · Q4166

    Office

    $116.19

    Facility

    Unavailable

    $23.28 lower than Chico for the office setting.

  • Minnesota

    Minnesota · Q4166

    Office

    $130.95

    Facility

    Unavailable

    $8.52 lower than Chico for the office setting.

  • Metropolitan Kansas City

    Missouri · Q4166

    Office

    $119.49

    Facility

    Unavailable

    $19.98 lower than Chico for the office setting.

  • Metropolitan St. Louis

    Missouri · Q4166

    Office

    $121.15

    Facility

    Unavailable

    $18.32 lower than Chico for the office setting.

  • Rest Of Missouri

    Missouri · Q4166

    Office

    $109.70

    Facility

    Unavailable

    $29.77 lower than Chico for the office setting.

  • Mississippi

    Mississippi · Q4166

    Office

    $109.57

    Facility

    Unavailable

    $29.90 lower than Chico for the office setting.

  • Montana**

    Montana · Q4166

    Office

    $127.26

    Facility

    Unavailable

    $12.21 lower than Chico for the office setting.

  • North Carolina

    North Carolina · Q4166

    Office

    $118.73

    Facility

    Unavailable

    $20.74 lower than Chico for the office setting.

  • North Dakota**

    North Dakota · Q4166

    Office

    $127.26

    Facility

    Unavailable

    $12.21 lower than Chico for the office setting.

  • Nebraska

    Nebraska · Q4166

    Office

    $117.46

    Facility

    Unavailable

    $22.01 lower than Chico for the office setting.

  • New Hampshire

    New Hampshire · Q4166

    Office

    $132.47

    Facility

    Unavailable

    $7.00 lower than Chico for the office setting.

  • Northern Nj

    New Jersey · Q4166

    Office

    $147.62

    Facility

    Unavailable

    $8.15 higher than Chico for the office setting.

  • Rest Of New Jersey

    New Jersey · Q4166

    Office

    $138.97

    Facility

    Unavailable

    $0.50 lower than Chico for the office setting.

  • New Mexico

    New Mexico · Q4166

    Office

    $116.70

    Facility

    Unavailable

    $22.77 lower than Chico for the office setting.

  • Nevada**

    Nevada · Q4166

    Office

    $127.38

    Facility

    Unavailable

    $12.09 lower than Chico for the office setting.

  • Nyc Suburbs/Long Island

    New York · Q4166

    Office

    $151.31

    Facility

    Unavailable

    $11.84 higher than Chico for the office setting.

  • Poughkpsie/N Nyc Suburbs

    New York · Q4166

    Office

    $139.35

    Facility

    Unavailable

    $0.12 lower than Chico for the office setting.

  • Queens

    New York · Q4166

    Office

    $150.42

    Facility

    Unavailable

    $10.95 higher than Chico for the office setting.

  • Rest Of New York

    New York · Q4166

    Office

    $120.89

    Facility

    Unavailable

    $18.58 lower than Chico for the office setting.

  • Ohio

    Ohio · Q4166

    Office

    $116.19

    Facility

    Unavailable

    $23.28 lower than Chico for the office setting.

  • Oklahoma

    Oklahoma · Q4166

    Office

    $113.64

    Facility

    Unavailable

    $25.83 lower than Chico for the office setting.

  • Portland

    Oregon · Q4166

    Office

    $141.38

    Facility

    Unavailable

    $1.91 higher than Chico for the office setting.

  • Rest Of Oregon

    Oregon · Q4166

    Office

    $126.75

    Facility

    Unavailable

    $12.72 lower than Chico for the office setting.

  • Metropolitan Philadelphia

    Pennsylvania · Q4166

    Office

    $132.47

    Facility

    Unavailable

    $7.00 lower than Chico for the office setting.

  • Rest Of Pennsylvania

    Pennsylvania · Q4166

    Office

    $116.82

    Facility

    Unavailable

    $22.65 lower than Chico for the office setting.

  • Puerto Rico

    Puerto Rico · Q4166

    Office

    $128.66

    Facility

    Unavailable

    $10.81 lower than Chico for the office setting.

  • Rhode Island

    Rhode Island · Q4166

    Office

    $131.46

    Facility

    Unavailable

    $8.01 lower than Chico for the office setting.

  • South Carolina

    South Carolina · Q4166

    Office

    $117.59

    Facility

    Unavailable

    $21.88 lower than Chico for the office setting.

  • South Dakota**

    South Dakota · Q4166

    Office

    $127.26

    Facility

    Unavailable

    $12.21 lower than Chico for the office setting.

  • Tennessee

    Tennessee · Q4166

    Office

    $115.68

    Facility

    Unavailable

    $23.79 lower than Chico for the office setting.

  • Austin

    Texas · Q4166

    Office

    $134.64

    Facility

    Unavailable

    $4.83 lower than Chico for the office setting.

  • Beaumont

    Texas · Q4166

    Office

    $115.80

    Facility

    Unavailable

    $23.67 lower than Chico for the office setting.

  • Brazoria

    Texas · Q4166

    Office

    $126.11

    Facility

    Unavailable

    $13.36 lower than Chico for the office setting.

  • Dallas

    Texas · Q4166

    Office

    $126.75

    Facility

    Unavailable

    $12.72 lower than Chico for the office setting.

  • Fort Worth

    Texas · Q4166

    Office

    $125.48

    Facility

    Unavailable

    $13.99 lower than Chico for the office setting.

  • Galveston

    Texas · Q4166

    Office

    $126.37

    Facility

    Unavailable

    $13.10 lower than Chico for the office setting.

  • Houston

    Texas · Q4166

    Office

    $126.37

    Facility

    Unavailable

    $13.10 lower than Chico for the office setting.

  • Rest Of Texas

    Texas · Q4166

    Office

    $120.77

    Facility

    Unavailable

    $18.70 lower than Chico for the office setting.

  • Utah

    Utah · Q4166

    Office

    $119.62

    Facility

    Unavailable

    $19.85 lower than Chico for the office setting.

  • Virginia

    Virginia · Q4166

    Office

    $125.09

    Facility

    Unavailable

    $14.38 lower than Chico for the office setting.

  • Virgin Islands

    United States Virgin Islands · Q4166

    Office

    $128.66

    Facility

    Unavailable

    $10.81 lower than Chico for the office setting.

  • Vermont

    Vermont · Q4166

    Office

    $125.98

    Facility

    Unavailable

    $13.49 lower than Chico for the office setting.

  • Rest Of Washington

    Washington · Q4166

    Office

    $134.00

    Facility

    Unavailable

    $5.47 lower than Chico for the office setting.

  • Seattle (King Cnty)

    Washington · Q4166

    Office

    $156.14

    Facility

    Unavailable

    $16.67 higher than Chico for the office setting.

  • Wisconsin

    Wisconsin · Q4166

    Office

    $121.91

    Facility

    Unavailable

    $17.56 lower than Chico for the office setting.

  • West Virginia

    West Virginia · Q4166

    Office

    $110.59

    Facility

    Unavailable

    $28.88 lower than Chico for the office setting.

  • Wyoming**

    Wyoming · Q4166

    Office

    $127.26

    Facility

    Unavailable

    $12.21 lower than Chico for the office setting.

See how rates vary across the country

Q4166 · 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.

$109.31

$161.49

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

View all state and territory rates as a table
State / territoryRate rangeLocalities
AK$135.531
AL$111.351
AR$109.311
AZ$123.311
CA$139.47–$183.5129
CO$135.401
CT$137.061
DC$149.911
DE$125.731
FL$121.66–$132.473
GA$113.51–$129.292
GU$144.691
HI$144.691
IA$116.441
ID$117.081
IL$116.19–$130.694
IN$117.971
KS$115.041
KY$113.131
LA$112.62–$119.752
MA$134.00–$151.952
MD$128.78–$149.913
ME$117.08–$126.112
MI$116.19–$122.802
MN$130.951
MO$109.70–$121.153
MS$109.571
MT$127.261
NC$118.731
ND$127.261
NE$117.461
NH$132.471
NJ$138.97–$147.622
NM$116.701
NV$127.381
NY$120.89–$151.315
OH$116.191
OK$113.641
OR$126.75–$141.382
PA$116.82–$132.472
PR$128.661
RI$131.461
SC$117.591
SD$127.261
TN$115.681
TX$115.80–$134.648
UT$119.621
VA$125.09–$149.912
VI$128.661
VT$125.981
WA$134.00–$156.142
WI$121.911
WV$110.591
WY$127.261

Explore Q4166 on the national rate map →

Where does this rate apply?

Chico is a Medicare payment area. Our Census mapping connects it to 30 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 Q4166 in Chico. This uses the base rate on this page, so the locality and release stay consistent.

Reference amount per service

$153.42

$139.47 × 110% = $153.42

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 Q4166 in Chico.

PPRRVU2026_Oct_nonQPP.csv

18,259

Code
Q4166
Physician work
0.00
Practice expense
3.81
Malpractice
0.00

GPCI2026.csv

9

Locality
Chico
Physician work
1.017
Practice expense
1.096
Malpractice
0.536
Office / nonfacility calculation for Q4166 in Chico
ComponentRVULocality factorAdjusted
Physician work0.00× 1.0170.0000
Practice expense3.81× 1.0964.1758
Malpractice0.00× 0.5360.0000
Total RVUs4.1758
Conversion factor× 33.4009

Office / nonfacility rate, Chico$139.47

Open Q4166 in the RVU calculator →

Explore RVUs, geographic factors and the full formula

Office / nonfacility

Office / nonfacility calculation inputs
ComponentRVULocal GPCI
Work01.017
Practice expense3.811.096
Malpractice00.536

(0 × 1.017 + 3.81 × 1.096 + 0 × 0.536) × $33.4009 = $139.47

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

Q4166 · Office / nonfacility

$139.47

Effective 2026-10-01

A rate is unavailable in one of these releases, so a change cannot be calculated.

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

    No ratechanged to$139.47

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    Earliest loaded release: No rate

    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$139.47Not available in this settingRVU26D
2026-07-01$139.47Not available in this settingRVU26C
2026-04-01$139.47Not available in this settingRVU26B
2026-01-01$139.47Not available in this settingRVU26A
2025-10-01Separate payment rules applySeparate payment rules applyRVU25D
2025-07-01Separate payment rules applySeparate payment rules applyRVU25C
2025-04-01Separate payment rules applySeparate payment rules applyRVU25B
2025-01-01Separate payment rules applySeparate payment rules applyRVU25A

Q4166 billing questions

When is Q4166 reported instead of another wound product code?

Use Q4166 when the material furnished is Cytal. Other wound matrices have their own HCPCS codes, even when they are applied to a similar wound.

Can Q4166 be billed by itself?

No. CMS identifies it as an add-on code that must be billed with a primary procedure; it is paid within that procedure's global period.

Is the wound application included in Q4166?

Q4166 reports the Cytal material by area, while the primary wound application procedure reports the clinician's application service. Document both the product amount and the application performed.

What supports the number of units?

Document the Cytal quantity used in square centimeters, along with the wound site and product identity. The code is measured by area, not by wound count or time.

Does Q4166 include a professional interpretation?

CMS classifies Q4166 as technical-component-only and assigns interpretation to a separate code. Q4166 itself reports the Cytal material.

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 Q4166PPRRVU2026_Oct_nonQPP.csv, line 18,259 (RVU26D)
Geographic factors for ChicoGPCI2026.csv, line 9 (RVU26D)
Open CMS sourceHow this rate is calculatedBuild a fee sheet