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ICD-10-CM 2027 diagnosis code

M61.172Myositis ossificans progressiva, left ankle

✓ Billable / specific

M61.172 is a valid, billable ICD-10-CM code for myositis ossificans progressiva, left ankle. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About M61.172

M61.172 is the ICD-10-CM diagnosis code for myositis ossificans progressiva, left ankle. It belongs to category M61 (calcification and ossification of muscle), block M60-M63 (disorders of muscles) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within M61.17 (myositis ossificans progressiva, ankle, foot and toe(s)), M61.172 is specifically for myositis ossificans progressiva, left ankle. Related codes cover right ankle (M61.171), unspecified ankle (M61.173), right foot (M61.174), left foot (M61.175), unspecified foot (M61.176), right toe(s) (M61.177), left toe(s) (M61.178) and unspecified toe(s) (M61.179).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 557 (Tendonitis, Myositis and Bursitis with MCC, relative weight 1.489) and DRG 558 (Tendonitis, Myositis and Bursitis without MCC, relative weight 0.8875), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 728.11 (progressive myositis ossificans).

Notes that apply from higher levels

Instructions written at a parent level also apply to M61.172.

Broader instructions also apply from M60-M63 Disorders of muscles and Chapter 13: Diseases of the musculoskeletal system and connective tissue.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 08 · Diseases and Disorders of the Musculoskeletal System and Connective Tissue

ICD-9-CM equivalent

Converter →
  • 728.11Progressive myositis ossificansapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about M61.172

Is M61.172 billable?

Yes. M61.172 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can M61.172 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict M61.172 as a principal diagnosis.

Is M61.172 a CC or MCC?

No. M61.172 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does M61.172 group to?

M61.172 is used in the MS-DRG v44.0 logic for MS-DRG 557 (Tendonitis, Myositis and Bursitis with MCC) and MS-DRG 558 (Tendonitis, Myositis and Bursitis without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for M61.172?

The CMS General Equivalence Mappings map M61.172 to ICD-9-CM 728.11.