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CPT code 17313: Mohs surgery, first stage, trunk or extremity2026 Medicare rate & RVUs in Colorado

Mohs surgery for a first tissue stage on the trunk, arms, or legs, including mapped specimen processing and microscopic margin assessment by the surgeon.

CMS RVU26DEffective Oct 1, 2026One payment locality205.7K Medicare services in 2024

In Colorado, Medicare pays $651.92 for 17313 in the office and $259.58 when it’s performed in a hospital or facility.

$651.92Office (non-facility)
$259.58Hospital or facility
+4.1%vs the national office rate ($626.27)

Check a contract rate as a % of Medicare · 17313 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 17313 for the payment locality that covers the ZIP.

On this page 11 sections
  1. Rate in Colorado
  2. What 17313 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 17313 covers

A Mohs surgeon removes a skin cancer in mapped tissue layers, processes and examines the tissue microscopically, and uses the findings to guide further removal while preserving uninvolved tissue. This code represents the first stage for a lesion on the trunk, an arm, or a leg. It is commonly used for cutaneous basal cell or squamous cell carcinomas treated in a dermatology office or hospital outpatient setting.

Report one first-stage service for the treated site, with the number of tissue blocks documented; the first stage includes up to five blocks. Record the anatomic site, mapping, blocks examined, and histologic findings. Additional stages are reported with 17314, and additional blocks beyond the included amount with 17315. Same-day preoperative and postoperative care is included in the 0-day global period. When other procedures are performed in the same session, the highest-valued procedure is paid in full and the others are subject to the standard multiple-procedure reduction. Modifier 50 is inappropriate. Medicare does not pay an assistant at surgery; co-surgeons and team surgery are not permitted.

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 Colorado compares for 17313

Across 109 of 109 payment localities, the office rate for 17313 runs from $557.40 in Arkansas to $826.94 in San Benito County, CA. Colorado pays $651.92. The RVUs are the same everywhere; the geographic indexes change the dollars.

17313 in Colorado vs other payment areas
  1. Colorado · this page$651.92
  2. Los Angeles, CA · California$705.98+$54.06
  3. Washington, DC area · District of Columbia$714.14+$62.22
  4. Miami, FL · Florida$670.86+$18.94
  5. Chicago, IL · Illinois$652.60+$0.68
  6. Manhattan, NY · New York$717.49+$65.57
  7. Alaska · Alaska$736.62+$84.70

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

Every other payment area

17313 in every other Medicare payment locality
Payment localityOfficeFacility
AlabamaAlabama$565.14$242.49
ArkansasArkansas$557.40$240.65
ArizonaArizona$610.46$253.15
Bakersfield, CACalifornia$663.83$259.68
Chico, CACalifornia$662.17$258.03
El Centro, CACalifornia$662.26$258.12
Fresno, CACalifornia$662.17$258.03
Hanford, CACalifornia$662.17$258.03

17313 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.

$557.40

$744.56

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

View every state and territory as a table
17313 office rate range by state
State / territoryOffice rate rangeLocalities
AK$736.621
AL$565.141
AR$557.401
AZ$610.461
CA$662.17–$826.9429
CO$651.921
CT$666.521
DC$714.141
DE$620.251
FL$616.36–$670.863
GA$583.49–$637.212
GU$677.391
HI$677.391
IA$579.251
ID$582.741
IL$599.04–$652.744
IN$585.961
KS$576.441
KY$577.311
LA$576.36–$603.452
MA$648.23–$714.682
MD$631.76–$714.143
ME$585.37–$615.892
MI$591.36–$623.452
MN$626.201
MO$566.81–$605.783
MS$562.221
MT$626.231
NC$591.231
ND$615.751
NE$582.341
NH$641.581
NJ$674.56–$707.282
NM$594.341
NV$623.741
NY$599.63–$733.835
OH$589.211
OK$576.571
OR$619.30–$672.092
PA$590.24–$650.472
PR$630.701
RI$641.901
SC$591.121
SD$614.511
TN$579.171
TX$586.53–$649.418
UT$598.811
VA$613.79–$714.142
VI$630.701
VT$613.251
WA$647.05–$729.132
WI$596.061
WV$577.891
WY$621.661

See 17313 in every payment locality

How the 17313 rate is calculated

Each of 17313’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 · 17313

RVUs × geographic indexes × conversion factor

Office or facility?

Work5.42

5.42 RVUs× 1.000 GPCI

Practice expense12.80

12.80 RVUs× 1.000 GPCI

Malpractice0.53

0.53 RVUs× 1.000 GPCI

Adjusted RVUs

18.7500

Conversion factor

$33.4009

Medicare rate

$626.27

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

The exact Colorado inputs and CMS source lines

PPRRVU2026_Oct_nonQPP.csv

1,648

Code
17313
Physician work
5.42
Practice expense
12.80
Malpractice
0.53

GPCI2026.csv

37

Locality
Colorado
Physician work
1.012
Practice expense
1.064
Malpractice
0.781
Office calculation for 17313 in Colorado
ComponentRVULocality factorAdjusted
Physician work5.42× 1.0125.4850
Practice expense12.80× 1.06413.6192
Malpractice0.53× 0.7810.4139
Total RVUs19.5182
Conversion factor× 33.4009

Office rate, Colorado$651.92

Office: (5.42 × 1.012 + 12.8 × 1.064 + 0.53 × 0.781) × $33.4009 = $651.92

Facility: (5.42 × 1.012 + 1.76 × 1.064 + 0.53 × 0.781) × $33.4009 = $259.58

Open 17313 in the RVU calculator

Payment rules and modifiers for 17313

The CMS indicators that decide how 17313 is paid alongside other services.

CMS payment indicators · 17313

Mohs surgery, first stage, trunk or extremity

RuleCMS valueWhat it means
Global period000Same-day global: pre- and post-op care on the day of the procedure is included.
Multiple procedures2Standard reduction: highest-valued procedure at 100%, others at 50%.
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.

What modifiers do to the payment

Modifier 51 · payment effect

With and without the modifier

17313 without 51 · national office

$626.27

Mohs surgery, first stage, trunk or extremity

17313-51 · Second procedure: 50%

$313.14

When this isn’t the highest-valued procedure in the session, Medicare pays 50% of its fee schedule amount (the highest is paid at 100%).

When to use modifier 51

Codes related to 17313

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

Codes related to 17313
CodeHow it relatesOffice range, Colorado
Add-on codes
17314Mohs stage, additional stage, trunk or limbAdditional Mohs stages for a lesion on the trunk, arms, or legs are reported with this first-stage service.$402.20
17315Mohs block, beyond first five blocksAdditional tissue blocks beyond the included amount may be reported with this service.$82.09
Same family
17311Mohs surgery, first stage, head/neck/hands/feet/genitaliaFirst-stage Mohs code for specified sites including the head, neck, hands, feet, and genitalia.$693.62
17312Mohs surgery, additional stage, specified sitesAdditional-stage Mohs code for the anatomic sites assigned to 17311.$419.88

How 17313 has changed in Colorado

17313 · Office / nonfacility

$651.92

Effective 2026-10-01

The base rate is $10.02 higher than on 2025-10-01, moving from $641.90 to $651.92 (1.6%).

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

    $641.90changed to$651.92

    • Conversion factor 32.3465 changed to 33.4009
    • Work RVU 5.56 changed to 5.42
    • Practice expense RVU 13.06 changed to 12.80
    • Malpractice RVU 0.59 changed to 0.53
    • Work GPCI 1.008 changed to 1.012
    • Practice expense GPCI 1.053 changed to 1.064
    • Malpractice GPCI 0.827 changed to 0.781

    Held through RVU26B, RVU26C, RVU26D.

  2. January 1, 2025

    RVU25A

    $661.00changed to$641.90

    • Conversion factor 33.2875 changed to 32.3465
    • Practice expense RVU 13.08 changed to 13.06
    • Malpractice RVU 0.58 changed to 0.59

    Held through RVU25B, RVU25C, RVU25D.

  3. March 9, 2024

    RVU24AR

    $650.21changed to$661.00

    • Conversion factor 32.7442 changed to 33.2875

    Held through RVU24B, RVU24C, RVU24D.

  4. January 1, 2024

    RVU24A

    $665.44changed to$650.21

    • Conversion factor 33.8872 changed to 32.7442
    • Practice expense RVU 12.94 changed to 13.08
    • Work GPCI 1.005 changed to 1.008
    • Practice expense GPCI 1.050 changed to 1.053
    • Malpractice GPCI 0.797 changed to 0.827

  5. January 1, 2023

    RVU23A

    $662.28changed to$665.44

    • Conversion factor 34.6062 changed to 33.8872
    • Practice expense RVU 12.56 changed to 12.94
    • Malpractice RVU 0.55 changed to 0.58
    • Work GPCI 1.001 changed to 1.005
    • Practice expense GPCI 1.047 changed to 1.050
    • Malpractice GPCI 0.767 changed to 0.797

    Held through RVU23B, RVU23C, RVU23D.

  6. January 1, 2022

    RVU22A

    $664.41changed to$662.28

    • Conversion factor 34.8931 changed to 34.6062
    • Practice expense RVU 12.49 changed to 12.56
    • Malpractice RVU 0.52 changed to 0.55

    Held through RVU22B, RVU22C, RVU22D.

  7. January 1, 2021

    RVU21A

    $649.35changed to$664.41

    • Conversion factor 36.0896 changed to 34.8931
    • Practice expense RVU 11.58 changed to 12.49
    • Work GPCI 1.000 changed to 1.001
    • Practice expense GPCI 1.033 changed to 1.047
    • Malpractice GPCI 0.905 changed to 0.767

    Held through RVU21B, RVU21C, RVU21D.

  8. January 1, 2020

    RVU20A

    $648.31changed to$649.35

    • Conversion factor 36.0391 changed to 36.0896
    • Practice expense RVU 11.37 changed to 11.58
    • Malpractice RVU 0.82 changed to 0.52
    • Practice expense GPCI 1.018 changed to 1.033
    • Malpractice GPCI 1.042 changed to 0.905

    Held through RVU20B, RVU20C, RVU20D.

  9. January 1, 2019

    RVU19A

    $642.11changed to$648.31

    • Conversion factor 35.9996 changed to 36.0391
    • Practice expense RVU 11.21 changed to 11.37
    • Malpractice RVU 0.83 changed to 0.82

    Held through RVU19B, RVU19C, RVU19D.

  10. January 1, 2018

    RVU18AR1

    $638.18changed to$642.11

    • Conversion factor 35.8887 changed to 35.9996
    • Practice expense RVU 11.17 changed to 11.21
    • Practice expense GPCI 1.015 changed to 1.018
    • Malpractice GPCI 1.066 changed to 1.042

    Held through RVU18B, RVU18C, RVU18D.

  11. January 1, 2017

    RVU17A

    $633.65changed to$638.18

    • Conversion factor 35.8043 changed to 35.8887
    • Practice expense RVU 11.10 changed to 11.17
    • Malpractice RVU 0.84 changed to 0.83
    • Practice expense GPCI 1.011 changed to 1.015
    • Malpractice GPCI 1.090 changed to 1.066

    Held through RVU17B, RVU17C, RVU17D.

  12. January 1, 2016

    RVU16A

    $633.17changed to$633.65

    • Conversion factor 35.9335 changed to 35.8043
    • Practice expense RVU 11.11 changed to 11.10
    • Malpractice RVU 0.76 changed to 0.84

    Held through RVU16B, RVU16C, RVU16D.

  13. July 1, 2015

    RVU15C

    $630.02changed to$633.17

    • Conversion factor 35.7547 changed to 35.9335

    Held through RVU15D.

  14. January 1, 2015

    RVU15A

    $616.23changed to$630.02

    • Conversion factor 35.8228 changed to 35.7547
    • Practice expense RVU 10.82 changed to 11.11
    • Malpractice RVU 0.75 changed to 0.76
    • Practice expense GPCI 1.008 changed to 1.011
    • Malpractice GPCI 0.981 changed to 1.090

    Held through RVU15B.

  15. January 1, 2014

    RVU14A

    $604.46changed to$616.23

    • Conversion factor 34.0230 changed to 35.8228
    • Practice expense RVU 11.48 changed to 10.82
    • Malpractice RVU 0.78 changed to 0.75
    • Practice expense GPCI 1.004 changed to 1.008
    • Malpractice GPCI 0.872 changed to 0.981

    Held through RVU14B, RVU14C, RVU14D.

  16. January 1, 2013

    RVU13AR

    Earliest loaded release: $604.46

    Held through RVU13B, RVU13C, RVU13D.

Rates in every CMS release
Effective fromOfficeFacilityCMS release
2026-10-01$651.92$259.58RVU26D
2026-07-01$651.92$259.58RVU26C
2026-04-01$651.92$259.58RVU26B
2026-01-01$651.92$259.58RVU26A
2025-10-01$641.90$311.85RVU25D
2025-07-01$641.90$311.85RVU25C
2025-04-01$641.90$311.85RVU25B
2025-01-01$641.90$311.85RVU25A
2024-10-01$661.00$318.20RVU24D
2024-07-01$661.00$318.20RVU24C
2024-04-01$661.00$318.20RVU24B
2024-03-09$661.00$318.20RVU24AR
2024-01-01$650.21$313.00RVU24A
2023-10-01$665.44$321.73RVU23D
2023-07-01$665.44$321.73RVU23C
2023-04-01$665.44$321.73RVU23B
2023-01-01$665.44$321.73RVU23A
2022-10-01$662.28$322.42RVU22D
2022-07-01$662.28$322.42RVU22C
2022-04-01$662.28$322.42RVU22B
2022-01-01$662.28$322.42RVU22A
2021-10-01$664.41$325.02RVU21D
2021-07-01$664.41$325.02RVU21C
2021-04-01$664.41$325.02RVU21B
2021-01-01$664.41$325.02RVU21A
2020-10-01$649.35$339.18RVU20D
2020-07-01$649.35$339.18RVU20C
2020-04-01$649.35$339.18RVU20B
2020-01-01$649.35$339.18RVU20A
2019-10-01$648.31$352.97RVU19D
2019-07-01$648.31$352.97RVU19C
2019-04-01$648.31$352.97RVU19B
2019-01-01$648.31$352.97RVU19A
2018-10-01$642.11$355.53RVU18D
2018-07-01$642.11$355.53RVU18C
2018-04-01$642.11$355.53RVU18B
2018-01-01$642.11$355.53RVU18AR1
2017-10-01$638.18$355.88RVU17D
2017-07-01$638.18$355.88RVU17C
2017-04-01$638.18$355.88RVU17B
2017-01-01$638.18$355.88RVU17A
2016-10-01$633.65$354.20RVU16D
2016-07-01$633.65$354.20RVU16C
2016-04-01$633.65$354.20RVU16B
2016-01-01$633.65$354.20RVU16A
2015-10-01$633.17$351.99RVU15D
2015-07-01$633.17$351.99RVU15C
2015-04-01$630.02$350.23RVU15B
2015-01-01$630.02$350.23RVU15A
2014-10-01$616.23$345.05RVU14D
2014-07-01$616.23$345.05RVU14C
2014-04-01$616.23$345.05RVU14B
2014-01-01$616.23$345.05RVU14A
2013-10-01$604.46$337.67RVU13D
2013-07-01$604.46$337.67RVU13C
2013-04-01$604.46$337.67RVU13B
2013-01-01$604.46$337.67RVU13AR

Price 17313 for an earlier date of service

Where the Colorado rate applies

Colorado is a Medicare payment area, not a city. Our Census mapping connects it to 485 cities and communities in Colorado. Some span more than one payment area; confirm with the service ZIP.

  • Acres Green
  • Aetna Estates
  • Aguilar
  • Air Force Academy
  • Akron
  • Alamosa
  • Alamosa East
  • Allenspark

Browse all communities in Colorado

17313 billing questions

How is 17313 distinguished from 17311?

Choose 17313 for the first Mohs stage on the trunk, arms, or legs. Code 17311 is for the first stage at specified sites including the head, neck, hands, feet, or genitalia.

How many tissue blocks are included?

The first stage includes up to five tissue blocks. Report additional blocks with 17315, and document the block count.

How are later Mohs stages reported?

For a lesion on the trunk, arm, or leg, report additional stages with 17314. Document each stage and its tissue findings.

Can modifier 50 be used for bilateral lesions?

No. Modifier 50 is inappropriate for this service; the CMS bilateral adjustment does not apply.

Can an assistant or co-surgeon be reported?

Medicare does not pay an assistant at surgery for this service. Co-surgeons and team surgery are not permitted.

What same-day care is included?

The 0-day global period includes the related preoperative and postoperative care provided on the procedure date.

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 17313PPRRVU2026_Oct_nonQPP.csv, line 1,648 (RVU26D)
Geographic factors for ColoradoGPCI2026.csv, line 37 (RVU26D)

Open CMS sourceHow we calculate rates

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