CPT code 88188: Flow cytometry, 9–15 markers2026 Medicare rate & RVUs in Baltimore area, MD

Reports a pathologist’s interpretation of flow cytometry findings when the analysis includes 9–15 markers, commonly for suspected hematologic malignancy.

CMS RVU26DEffective Oct 1, 2026One payment locality44.9K Medicare services in 2024

In Baltimore area, MD, Medicare pays $60.82 for 88188 in the office and $60.82 when it’s performed in a hospital or facility.

$60.82Office (non-facility)
$60.82Hospital or facility
+4.1%vs the national office rate ($58.45)

Check a contract rate as a % of Medicare · 88188 nationwide

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

We’ll open 88188 for the payment locality that covers the ZIP.

On this page 11 sections
  1. Rate in Baltimore area, MD
  2. What 88188 covers
  3. Compared with other areas
  4. Rate map
  5. How it’s calculated
  6. Payment rules
  7. Related codes
  8. Rate history
  9. Where it applies
  10. Billing questions
  11. Sources

What 88188 covers

This service is the professional interpretation and written report of flow cytometry findings from a panel of 9–15 markers. A pathologist or other qualified laboratory professional may evaluate results from peripheral blood, bone marrow, lymph node, or fluid specimens when assessing suspected leukemia, lymphoma, or another hematologic disorder. The report interprets the cell populations and marker pattern in the clinical context; it is not the laboratory work that processes and analyzes the specimen.

Select this code according to the number of markers included in the interpretation: 9–15. The record should support the specimen examined, markers assessed, findings, and resulting interpretation. Report the professional service separately from the applicable technical flow cytometry services; the technical portion is covered by separate codes. This code represents interpretation and reporting only.

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.

How Baltimore area, MD compares for 88188

Across 109 of 109 payment localities, the office rate for 88188 runs from $55.03 in Arkansas to $78.22 in Alaska. Baltimore area, MD pays $60.82. The RVUs are the same everywhere; the geographic indexes change the dollars.

88188 in Baltimore area, MD vs other payment areas
  1. Baltimore area, MD · this page$60.82
  2. Rest of Maryland · Maryland$58.89−$1.93
  3. Los Angeles, CA · California$62.56+$1.74
  4. Washington, DC area · District of Columbia$63.88+$3.06
  5. Miami, FL · Florida$62.23+$1.41
  6. Chicago, IL · Illinois$61.41+$0.59
  7. Manhattan, NY · New York$64.94+$4.12

Other areas in Maryland first, then benchmark localities. Bars start at $0.

Every other payment area

88188 in every other Medicare payment locality
Payment localityOfficeFacility
AlaskaAlaska$78.22$78.22
AlabamaAlabama$55.41$55.41
ArkansasArkansas$55.03$55.03
ArizonaArizona$57.62$57.62
Bakersfield, CACalifornia$60.08$60.08
Chico, CACalifornia$59.85$59.85
El Centro, CACalifornia$59.86$59.86
Fresno, CACalifornia$59.85$59.85

88188 rates by state

Office rate range in each state. Select a state to see its payment localities.

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.

$55.03

$78.22

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

View every state and territory as a table
88188 office rate range by state
State / territoryOffice rate rangeLocalities
AK$78.221
AL$55.411
AR$55.031
AZ$57.621
CA$59.85–$69.5029
CO$59.591
CT$60.991
DC$63.881
DE$58.241
FL$58.70–$62.233
GA$56.96–$59.252
GU$59.991
HI$59.991
IA$55.771
ID$56.011
IL$58.07–$61.414
IN$56.151
KS$55.791
KY$56.351
LA$56.37–$57.702
MA$59.59–$63.202
MD$58.89–$63.883
ME$56.30–$57.562
MI$57.20–$59.222
MN$57.541
MO$56.00–$57.623
MS$55.511
MT$58.451
NC$56.561
ND$57.261
NE$55.871
NH$58.911
NJ$61.81–$63.832
NM$57.411
NV$58.131
NY$56.99–$65.955
OH$56.961
OK$56.151
OR$57.79–$60.492
PA$56.92–$60.252
PR$58.611
RI$59.551
SC$56.831
SD$57.121
TN$55.941
TX$56.75–$59.408
UT$57.211
VA$57.57–$63.882
VI$58.611
VT$57.291
WA$59.40–$63.982
WI$56.341
WV$57.041
WY$57.931

See 88188 in every payment locality

How the 88188 rate is calculated

Each of 88188’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.

How the rate is built · 88188

RVUs × geographic indexes × conversion factor

Office or facility?

Work1.17

1.17 RVUs× 1.000 GPCI

Practice expense0.52

0.52 RVUs× 1.000 GPCI

Malpractice0.06

0.06 RVUs× 1.000 GPCI

Adjusted RVUs

1.7500

Conversion factor

$33.4009

Medicare rate

$58.45

Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.

The exact Baltimore area, MD inputs and CMS source lines

PPRRVU2026_Oct_nonQPP.csv

11,165

Code
88188
Physician work
1.17
Practice expense
0.52
Malpractice
0.06

GPCI2026.csv

60

Locality
Baltimore area, MD
Physician work
1.016
Practice expense
1.073
Malpractice
1.237
Office calculation for 88188 in Baltimore area, MD
ComponentRVULocality factorAdjusted
Physician work1.17× 1.0161.1887
Practice expense0.52× 1.0730.5580
Malpractice0.06× 1.2370.0742
Total RVUs1.8209
Conversion factor× 33.4009

Office rate, Baltimore area, MD$60.82

Office: (1.17 × 1.016 + 0.52 × 1.073 + 0.06 × 1.237) × $33.4009 = $60.82

Facility: (1.17 × 1.016 + 0.52 × 1.073 + 0.06 × 1.237) × $33.4009 = $60.82

Open 88188 in the RVU calculator

Payment rules and modifiers for 88188

The CMS indicators that decide how 88188 is paid alongside other services.

CMS payment indicators · 88188

Flow cytometry, 9–15 markers

RuleCMS valueWhat it means
Global periodXXXThe global surgery concept doesn’t apply.
Multiple procedures0No multiple-procedure reduction.
Bilateral (modifier 50)0The 150% bilateral adjustment doesn’t apply.
Assistant at surgery (80/81/82/AS)0Not paid without supporting documentation.
Co-surgeons (62)0Not permitted.
Team surgery (66)0Not permitted.
Professional/technical2Professional component only.

How 88188 has changed in Baltimore area, MD

88188 · Office / nonfacility

$60.82

Effective 2026-10-01

The base rate is $0.07 lower than on 2025-10-01, moving from $60.89 to $60.82 (0.1%).

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

    $60.89changed to$60.82

    • Conversion factor 32.3465 changed to 33.4009
    • Work RVU 1.20 changed to 1.17
    • Practice expense RVU 0.55 changed to 0.52
    • Malpractice RVU 0.05 changed to 0.06
    • Work GPCI 1.020 changed to 1.016
    • Practice expense GPCI 1.078 changed to 1.073
    • Malpractice GPCI 1.309 changed to 1.237

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    $63.09changed to$60.89

    • Conversion factor 33.2875 changed to 32.3465
    • Malpractice RVU 0.06 changed to 0.05

    Held through RVU25B, RVU25C, RVU25D.

  3. March 9, 2024

    RVU24AR

    $62.06changed to$63.09

    • Conversion factor 32.7442 changed to 33.2875

    Held through RVU24B, RVU24C, RVU24D.

  4. January 1, 2024

    RVU24A

    $64.93changed to$62.06

    • Conversion factor 33.8872 changed to 32.7442
    • Practice expense RVU 0.56 changed to 0.55
    • Work GPCI 1.024 changed to 1.020
    • Practice expense GPCI 1.087 changed to 1.078
    • Malpractice GPCI 1.311 changed to 1.309
  5. January 1, 2023

    RVU23A

    $66.81changed to$64.93

    • Conversion factor 34.6062 changed to 33.8872
    • Practice expense RVU 0.54 changed to 0.56
    • Malpractice RVU 0.08 changed to 0.06
    • Work GPCI 1.028 changed to 1.024
    • Practice expense GPCI 1.096 changed to 1.087
    • Malpractice GPCI 1.313 changed to 1.311

    Held through RVU23B, RVU23C, RVU23D.

  6. January 1, 2022

    RVU22A

    $66.37changed to$66.81

    • Conversion factor 34.8931 changed to 34.6062
    • Practice expense RVU 0.55 changed to 0.54
    • Malpractice RVU 0.05 changed to 0.08

    Held through RVU22B, RVU22C, RVU22D.

  7. January 1, 2021

    RVU21A

    $69.78changed to$66.37

    • Conversion factor 36.0896 changed to 34.8931
    • Practice expense RVU 0.57 changed to 0.55
    • Malpractice RVU 0.06 changed to 0.05
    • Work GPCI 1.026 changed to 1.028
    • Practice expense GPCI 1.095 changed to 1.096
    • Malpractice GPCI 1.304 changed to 1.313

    Held through RVU21B, RVU21C, RVU21D.

  8. January 1, 2020

    RVU20A

    $69.54changed to$69.78

    • Conversion factor 36.0391 changed to 36.0896
    • Work GPCI 1.023 changed to 1.026
    • Malpractice GPCI 1.295 changed to 1.304

    Held through RVU20B, RVU20C, RVU20D.

  9. January 1, 2019

    RVU19A

    $70.25changed to$69.54

    • Conversion factor 35.9996 changed to 36.0391
    • Practice expense RVU 0.59 changed to 0.57

    Held through RVU19B, RVU19C, RVU19D.

  10. January 1, 2018

    RVU18AR1

    $79.76changed to$70.25

    • Conversion factor 35.8887 changed to 35.9996
    • Practice expense RVU 0.84 changed to 0.59
    • Practice expense GPCI 1.096 changed to 1.095
    • Malpractice GPCI 1.238 changed to 1.295

    Held through RVU18B, RVU18C, RVU18D.

  11. January 1, 2017

    RVU17A

    $97.91changed to$79.76

    • Conversion factor 35.8043 changed to 35.8887
    • Work RVU 1.69 changed to 1.20
    • Practice expense RVU 0.82 changed to 0.84
    • Malpractice RVU 0.09 changed to 0.06
    • Practice expense GPCI 1.097 changed to 1.096
    • Malpractice GPCI 1.181 changed to 1.238

    Held through RVU17B, RVU17C, RVU17D.

  12. January 1, 2016

    RVU16A

    $97.08changed to$97.91

    • Conversion factor 35.9335 changed to 35.8043
    • Practice expense RVU 0.79 changed to 0.82

    Held through RVU16B, RVU16C, RVU16D.

  13. July 1, 2015

    RVU15C

    $96.60changed to$97.08

    • Conversion factor 35.7547 changed to 35.9335

    Held through RVU15D.

  14. January 1, 2015

    RVU15A

    $95.02changed to$96.60

    • Conversion factor 35.8228 changed to 35.7547
    • Practice expense RVU 0.73 changed to 0.79
    • Malpractice RVU 0.10 changed to 0.09
    • Work GPCI 1.025 changed to 1.023
    • Malpractice GPCI 1.194 changed to 1.181

    Held through RVU15B.

  15. January 1, 2014

    RVU14A

    $92.64changed to$95.02

    • Conversion factor 34.0230 changed to 35.8228
    • Practice expense RVU 0.79 changed to 0.73
    • Work GPCI 1.027 changed to 1.025
    • Malpractice GPCI 1.206 changed to 1.194

    Held through RVU14B, RVU14C, RVU14D.

  16. January 1, 2013

    RVU13AR

    Earliest loaded release: $92.64

    Held through RVU13B, RVU13C, RVU13D.

Rates in every CMS release
Effective fromOfficeFacilityCMS release
2026-10-01$60.82$60.82RVU26D
2026-07-01$60.82$60.82RVU26C
2026-04-01$60.82$60.82RVU26B
2026-01-01$60.82$60.82RVU26A
2025-10-01$60.89$60.89RVU25D
2025-07-01$60.89$60.89RVU25C
2025-04-01$60.89$60.89RVU25B
2025-01-01$60.89$60.89RVU25A
2024-10-01$63.09$63.09RVU24D
2024-07-01$63.09$63.09RVU24C
2024-04-01$63.09$63.09RVU24B
2024-03-09$63.09$63.09RVU24AR
2024-01-01$62.06$62.06RVU24A
2023-10-01$64.93$64.93RVU23D
2023-07-01$64.93$64.93RVU23C
2023-04-01$64.93$64.93RVU23B
2023-01-01$64.93$64.93RVU23A
2022-10-01$66.81$66.81RVU22D
2022-07-01$66.81$66.81RVU22C
2022-04-01$66.81$66.81RVU22B
2022-01-01$66.81$66.81RVU22A
2021-10-01$66.37$66.37RVU21D
2021-07-01$66.37$66.37RVU21C
2021-04-01$66.37$66.37RVU21B
2021-01-01$66.37$66.37RVU21A
2020-10-01$69.78$69.78RVU20D
2020-07-01$69.78$69.78RVU20C
2020-04-01$69.78$69.78RVU20B
2020-01-01$69.78$69.78RVU20A
2019-10-01$69.54$69.54RVU19D
2019-07-01$69.54$69.54RVU19C
2019-04-01$69.54$69.54RVU19B
2019-01-01$69.54$69.54RVU19A
2018-10-01$70.25$70.25RVU18D
2018-07-01$70.25$70.25RVU18C
2018-04-01$70.25$70.25RVU18B
2018-01-01$70.25$70.25RVU18AR1
2017-10-01$79.76$79.76RVU17D
2017-07-01$79.76$79.76RVU17C
2017-04-01$79.76$79.76RVU17B
2017-01-01$79.76$79.76RVU17A
2016-10-01$97.91$97.91RVU16D
2016-07-01$97.91$97.91RVU16C
2016-04-01$97.91$97.91RVU16B
2016-01-01$97.91$97.91RVU16A
2015-10-01$97.08$97.08RVU15D
2015-07-01$97.08$97.08RVU15C
2015-04-01$96.60$96.60RVU15B
2015-01-01$96.60$96.60RVU15A
2014-10-01$95.02$95.02RVU14D
2014-07-01$95.02$95.02RVU14C
2014-04-01$95.02$95.02RVU14B
2014-01-01$95.02$95.02RVU14A
2013-10-01$92.64$92.64RVU13D
2013-07-01$92.64$92.64RVU13C
2013-04-01$92.64$92.64RVU13B
2013-01-01$92.64$92.64RVU13AR

Price 88188 for an earlier date of service

Where the Baltimore area, MD rate applies

Baltimore area, MD is a Medicare payment area, not a city. Our Census mapping connects it to 100 cities and communities in Maryland. Some span more than one payment area; confirm with the service ZIP.

  • Baltimore
  • Aberdeen
  • Aberdeen Proving Ground
  • Abingdon
  • Annapolis
  • Annapolis Neck
  • Arbutus
  • Arden on the Severn

Browse all communities in Maryland

88188 billing questions

How is 88188 selected over 88187 or 88189?

Choose 88188 when the interpretation covers 9–15 markers. The neighboring interpretation codes represent 2–8 markers and 16 or more markers, respectively.

Does 88188 include specimen processing and flow analysis?

No. It covers the professional interpretation and report; separate codes represent the technical flow cytometry work.

Should modifier 26 be appended?

No. 88188 is a professional-component-only code for interpretation and reporting.

Is 88188 reported once per marker?

No. Select the interpretation code based on the total marker count; 88188 represents a 9–15-marker analysis, not an individual marker.

What documentation supports reporting 88188?

Document the specimen, the markers assessed, the interpreted findings, and the report. The documentation should support that the interpreted panel falls within the 9–15-marker range.

Where these rates come from

FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.

CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027

Show the CMS file lines behind this rate
RVUs for 88188PPRRVU2026_Oct_nonQPP.csv, line 11,165 (RVU26D)
Geographic factors for Baltimore area, MDGPCI2026.csv, line 60 (RVU26D)

Open CMS sourceHow we calculate rates

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