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CPT code 17315: Mohs block, beyond first five blocks2026 Medicare rate & RVUs in Connecticut

Reports each Mohs tissue block beyond the first five in a stage when additional mapped specimens are needed for microscopic margin assessment.

CMS RVU26DEffective Oct 1, 2026One payment locality18.8K Medicare services in 2024

In Connecticut, Medicare pays $83.95 for 17315 in the office and $41.86 when it’s performed in a hospital or facility.

$83.95Office (non-facility)
$41.86Hospital or facility
+6.1%vs the national office rate ($79.16)

Check a contract rate as a % of Medicare · 17315 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 17315 for the payment locality that covers the ZIP.

On this page 11 sections
  1. Rate in Connecticut
  2. What 17315 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 17315 covers

During Mohs micrographic surgery, the operating physician removes and maps tumor-bearing skin, then examines prepared tissue microscopically to assess margins. Code 17315 captures tissue blocks beyond the five-block allowance for a stage. It is reported when a stage requires more than five mapped specimens for microscopic margin assessment, commonly during staged excision of a cutaneous cancer. Mohs surgeons most often perform this work in office-based dermatologic surgery.

Report 17315 for each excess block with the appropriate Mohs stage code: 17311 or 17312 for head, neck, hands, feet, genitalia, or specified complex sites; 17313 or 17314 for trunk, arms, or legs. The operative and pathology records should support the site, stages, mapping, and block count. An additional block is distinct from an additional stage, which is reported with the applicable stage code. CMS classifies 17315 as an add-on: bill it only with a primary procedure, and payment falls within that procedure’s global period.

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 Connecticut compares for 17315

Across 109 of 109 payment localities, the office rate for 17315 runs from $71.20 in Arkansas to $102.60 in San Benito County, CA. Connecticut pays $83.95. The RVUs are the same everywhere; the geographic indexes change the dollars.

17315 in Connecticut vs other payment areas
  1. Connecticut · this page$83.95
  2. Los Angeles, CA · California$88.40+$4.45
  3. Washington, DC area · District of Columbia$89.58+$5.63
  4. Miami, FL · Florida$84.72+$0.77
  5. Chicago, IL · Illinois$82.63−$1.32
  6. Manhattan, NY · New York$90.19+$6.24
  7. Alaska · Alaska$95.45+$11.50

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

Every other payment area

17315 in every other Medicare payment locality
Payment localityOfficeFacility
AlabamaAlabama$72.09$37.90
ArkansasArkansas$71.20$37.63
ArizonaArizona$77.32$39.45
Bakersfield, CACalifornia$83.43$40.60
Chico, CACalifornia$83.21$40.38
El Centro, CACalifornia$83.22$40.39
Fresno, CACalifornia$83.21$40.38
Hanford, CACalifornia$83.21$40.38

17315 rates by state

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

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.

$71.20

$95.45

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

View every state and territory as a table
17315 office rate range by state
State / territoryOffice rate rangeLocalities
AK$95.451
AL$72.091
AR$71.201
AZ$77.321
CA$83.21–$102.6029
CO$82.091
CT$83.951
DC$89.581
DE$78.481
FL$78.21–$84.723
GA$74.38–$80.492
GU$84.811
HI$84.811
IA$73.631
ID$74.051
IL$76.26–$82.634
IN$74.421
KS$73.351
KY$73.591
LA$73.49–$76.622
MA$81.71–$89.462
MD$79.83–$89.583
ME$74.40–$77.862
MI$75.25–$79.072
MN$78.921
MO$72.42–$76.843
MS$71.821
MT$79.161
NC$75.071
ND$77.771
NE$73.981
NH$80.851
NJ$84.98–$88.862
NM$75.611
NV$78.821
NY$76.04–$92.135
OH$74.971
OK$73.461
OR$78.27–$84.392
PA$75.06–$82.112
PR$79.661
RI$81.051
SC$75.131
SD$77.611
TN$73.671
TX$74.64–$81.768
UT$76.021
VA$77.65–$89.582
VI$79.661
VT$77.521
WA$81.54–$91.152
WI$75.511
WV$73.821
WY$78.551

See 17315 in every payment locality

How the 17315 rate is calculated

Each of 17315’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 · 17315

RVUs × geographic indexes × conversion factor

Office or facility?

Work0.85

0.85 RVUs× 1.000 GPCI

Practice expense1.45

1.45 RVUs× 1.000 GPCI

Malpractice0.07

0.07 RVUs× 1.000 GPCI

Adjusted RVUs

2.3700

Conversion factor

$33.4009

Medicare rate

$79.16

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

The exact Connecticut inputs and CMS source lines

PPRRVU2026_Oct_nonQPP.csv

1,650

Code
17315
Physician work
0.85
Practice expense
1.45
Malpractice
0.07

GPCI2026.csv

38

Locality
Connecticut
Physician work
1.020
Practice expense
1.077
Malpractice
1.210
Office calculation for 17315 in Connecticut
ComponentRVULocality factorAdjusted
Physician work0.85× 1.0200.8670
Practice expense1.45× 1.0771.5616
Malpractice0.07× 1.2100.0847
Total RVUs2.5134
Conversion factor× 33.4009

Office rate, Connecticut$83.95

Office: (0.85 × 1.02 + 1.45 × 1.077 + 0.07 × 1.21) × $33.4009 = $83.95

Facility: (0.85 × 1.02 + 0.28 × 1.077 + 0.07 × 1.21) × $33.4009 = $41.86

Open 17315 in the RVU calculator

Payment rules and modifiers for 17315

The CMS indicators that decide how 17315 is paid alongside other services.

CMS payment indicators · 17315

Mohs block, beyond first five blocks

RuleCMS valueWhat it means
Global periodZZZAdd-on code: falls within the primary procedure’s global period.
Multiple procedures0No multiple-procedure reduction.
Bilateral (modifier 50)0The 150% bilateral adjustment doesn’t apply.
Assistant at surgery (80/81/82/AS)1Not paid (statutory restriction).
Co-surgeons (62)0Not permitted.
Team surgery (66)0Not permitted.
Professional/technical0Physician service: no professional/technical split.

Codes related to 17315

Related codes aren’t interchangeable: bill the code that matches the service performed.

Codes related to 17315
CodeHow it relatesOffice range, Connecticut
Primary code
17311Mohs surgery, first stage, head/neck/hands/feet/genitaliaPrimary Mohs stage code for specified head, neck, hand, foot, genital, or complex sites.$709.48
17312Mohs surgery, additional stage, specified sitesAdditional-stage code for specified head, neck, hand, foot, genital, or complex sites.$429.17
17313Mohs surgery, first stage, trunk or extremityPrimary Mohs stage code for trunk, arms, or legs.$666.52
17314Mohs stage, additional stage, trunk or limbAdditional-stage code for trunk, arms, or legs.$410.74

How 17315 has changed in Connecticut

17315 · Office / nonfacility

$83.95

Effective 2026-10-01

The base rate is $0.19 higher than on 2025-10-01, moving from $83.76 to $83.95 (0.2%).

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

    $83.76changed to$83.95

    • Conversion factor 32.3465 changed to 33.4009
    • Work RVU 0.87 changed to 0.85
    • Practice expense RVU 1.47 changed to 1.45
    • Malpractice RVU 0.08 changed to 0.07
    • Work GPCI 1.022 changed to 1.020
    • Practice expense GPCI 1.091 changed to 1.077
    • Malpractice GPCI 1.207 changed to 1.210

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    $85.51changed to$83.76

    • Conversion factor 33.2875 changed to 32.3465
    • Practice expense RVU 1.44 changed to 1.47
    • Malpractice RVU 0.09 changed to 0.08

    Held through RVU25B, RVU25C, RVU25D.

  3. March 9, 2024

    RVU24AR

    $84.11changed to$85.51

    • Conversion factor 32.7442 changed to 33.2875

    Held through RVU24B, RVU24C, RVU24D.

  4. January 1, 2024

    RVU24A

    $85.90changed to$84.11

    • Conversion factor 33.8872 changed to 32.7442
    • Practice expense RVU 1.39 changed to 1.44
    • Malpractice RVU 0.10 changed to 0.09
    • Work GPCI 1.030 changed to 1.022
    • Practice expense GPCI 1.102 changed to 1.091
    • Malpractice GPCI 1.070 changed to 1.207

  5. January 1, 2023

    RVU23A

    $84.63changed to$85.90

    • Conversion factor 34.6062 changed to 33.8872
    • Practice expense RVU 1.31 changed to 1.39
    • Malpractice RVU 0.09 changed to 0.10
    • Work GPCI 1.037 changed to 1.030
    • Practice expense GPCI 1.114 changed to 1.102
    • Malpractice GPCI 0.934 changed to 1.070

    Held through RVU23B, RVU23C, RVU23D.

  6. January 1, 2022

    RVU22A

    $84.95changed to$84.63

    • Conversion factor 34.8931 changed to 34.6062
    • Practice expense RVU 1.30 changed to 1.31

    Held through RVU22B, RVU22C, RVU22D.

  7. January 1, 2021

    RVU21A

    $86.47changed to$84.95

    • Conversion factor 36.0896 changed to 34.8931
    • Practice expense RVU 1.26 changed to 1.30
    • Work GPCI 1.029 changed to 1.037
    • Practice expense GPCI 1.113 changed to 1.114
    • Malpractice GPCI 1.094 changed to 0.934

    Held through RVU21B, RVU21C, RVU21D.

  8. January 1, 2020

    RVU20A

    $88.39changed to$86.47

    • Conversion factor 36.0391 changed to 36.0896
    • Malpractice RVU 0.13 changed to 0.09
    • Work GPCI 1.021 changed to 1.029
    • Practice expense GPCI 1.112 changed to 1.113
    • Malpractice GPCI 1.255 changed to 1.094

    Held through RVU20B, RVU20C, RVU20D.

  9. January 1, 2019

    RVU19A

    $89.09changed to$88.39

    • Conversion factor 35.9996 changed to 36.0391
    • Practice expense RVU 1.28 changed to 1.26

    Held through RVU19B, RVU19C, RVU19D.

  10. January 1, 2018

    RVU18AR1

    $89.06changed to$89.09

    • Conversion factor 35.8887 changed to 35.9996
    • Work GPCI 1.023 changed to 1.021
    • Practice expense GPCI 1.117 changed to 1.112
    • Malpractice GPCI 1.244 changed to 1.255

    Held through RVU18B, RVU18C, RVU18D.

  11. January 1, 2017

    RVU17A

    $88.20changed to$89.06

    • Conversion factor 35.8043 changed to 35.8887
    • Practice expense RVU 1.26 changed to 1.28
    • Work GPCI 1.024 changed to 1.023
    • Practice expense GPCI 1.121 changed to 1.117
    • Malpractice GPCI 1.232 changed to 1.244

    Held through RVU17B, RVU17C, RVU17D.

  12. January 1, 2016

    RVU16A

    $88.04changed to$88.20

    • Conversion factor 35.9335 changed to 35.8043
    • Practice expense RVU 1.27 changed to 1.26
    • Malpractice RVU 0.11 changed to 0.13

    Held through RVU16B, RVU16C, RVU16D.

  13. July 1, 2015

    RVU15C

    $87.60changed to$88.04

    • Conversion factor 35.7547 changed to 35.9335

    Held through RVU15D.

  14. January 1, 2015

    RVU15A

    $85.95changed to$87.60

    • Conversion factor 35.8228 changed to 35.7547
    • Practice expense RVU 1.23 changed to 1.27
    • Practice expense GPCI 1.116 changed to 1.121
    • Malpractice GPCI 1.234 changed to 1.232

    Held through RVU15B.

  15. January 1, 2014

    RVU14A

    $85.54changed to$85.95

    • Conversion factor 34.0230 changed to 35.8228
    • Practice expense RVU 1.34 changed to 1.23
    • Practice expense GPCI 1.110 changed to 1.116
    • Malpractice GPCI 1.235 changed to 1.234

    Held through RVU14B, RVU14C, RVU14D.

  16. January 1, 2013

    RVU13AR

    Earliest loaded release: $85.54

    Held through RVU13B, RVU13C, RVU13D.

Rates in every CMS release
Effective fromOfficeFacilityCMS release
2026-10-01$83.95$41.86RVU26D
2026-07-01$83.95$41.86RVU26C
2026-04-01$83.95$41.86RVU26B
2026-01-01$83.95$41.86RVU26A
2025-10-01$83.76$50.59RVU25D
2025-07-01$83.76$50.59RVU25C
2025-04-01$83.76$50.59RVU25B
2025-01-01$83.76$50.59RVU25A
2024-10-01$85.51$52.10RVU24D
2024-07-01$85.51$52.10RVU24C
2024-04-01$85.51$52.10RVU24B
2024-03-09$85.51$52.10RVU24AR
2024-01-01$84.11$51.25RVU24A
2023-10-01$85.90$53.41RVU23D
2023-07-01$85.90$53.41RVU23C
2023-04-01$85.90$53.41RVU23B
2023-01-01$85.90$53.41RVU23A
2022-10-01$84.63$53.41RVU22D
2022-07-01$84.63$53.41RVU22C
2022-04-01$84.63$53.41RVU22B
2022-01-01$84.63$53.41RVU22A
2021-10-01$84.95$53.85RVU21D
2021-07-01$84.95$53.85RVU21C
2021-04-01$84.95$53.85RVU21B
2021-01-01$84.95$53.85RVU21A
2020-10-01$86.47$56.35RVU20D
2020-07-01$86.47$56.35RVU20C
2020-04-01$86.47$56.35RVU20B
2020-01-01$86.47$56.35RVU20A
2019-10-01$88.39$58.73RVU19D
2019-07-01$88.39$58.73RVU19C
2019-04-01$88.39$58.73RVU19B
2019-01-01$88.39$58.73RVU19A
2018-10-01$89.09$59.07RVU18D
2018-07-01$89.09$59.07RVU18C
2018-04-01$89.09$59.07RVU18B
2018-01-01$89.09$59.07RVU18AR1
2017-10-01$89.06$59.39RVU17D
2017-07-01$89.06$59.39RVU17C
2017-04-01$89.06$59.39RVU17B
2017-01-01$89.06$59.39RVU17A
2016-10-01$88.20$58.90RVU16D
2016-07-01$88.20$58.90RVU16C
2016-04-01$88.20$58.90RVU16B
2016-01-01$88.20$58.90RVU16A
2015-10-01$88.04$58.23RVU15D
2015-07-01$88.04$58.23RVU15C
2015-04-01$87.60$57.94RVU15B
2015-01-01$87.60$57.94RVU15A
2014-10-01$85.95$57.17RVU14D
2014-07-01$85.95$57.17RVU14C
2014-04-01$85.95$57.17RVU14B
2014-01-01$85.95$57.17RVU14A
2013-10-01$85.54$56.46RVU13D
2013-07-01$85.54$56.46RVU13C
2013-04-01$85.54$56.46RVU13B
2013-01-01$85.54$56.46RVU13AR

Price 17315 for an earlier date of service

Where the Connecticut rate applies

Connecticut is a Medicare payment area, not a city. Our Census mapping connects it to 215 cities and communities in Connecticut. Some span more than one payment area; confirm with the service ZIP.

  • Ansonia
  • Ball Pond
  • Baltic
  • Bantam
  • Bethel
  • Bethlehem Village
  • Bigelow Corners
  • Blue Hills

Browse all communities in Connecticut

17315 billing questions

Does 17315 represent another Mohs stage?

No. It reports each tissue block beyond the first five in a stage; an additional stage is reported with 17312 or 17314, as appropriate.

How many units should be reported?

Report one unit for each tissue block beyond five in a stage. Count the blocks for each stage separately.

Can 17315 be billed by itself?

No. It is an add-on code and must be reported with the applicable primary Mohs procedure.

Which Mohs stage code accompanies 17315?

Use 17311 or 17312 for the applicable head, neck, hands, feet, genitalia, or specified complex sites, and 17313 or 17314 for trunk, arms, or legs.

What documentation supports 17315?

The operative and pathology records should identify the Mohs site and stages, describe the tissue mapping, and support the number of blocks, including those beyond five in a stage.

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 17315PPRRVU2026_Oct_nonQPP.csv, line 1,650 (RVU26D)
Geographic factors for ConnecticutGPCI2026.csv, line 38 (RVU26D)

Open CMS sourceHow we calculate rates

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