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ICD-10-CM 2027 diagnosis code

M61.331Calcification and ossification of muscles associated with burns, right forearm

✓ Billable / specific

M61.331 is a valid, billable ICD-10-CM code for calcification and ossification of muscles associated with burns, right forearm. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Calcifcn and ossifictn of muscles assoc w burns, r forearm

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 M61.331

M61.331 is the ICD-10-CM diagnosis code for calcification and ossification of muscles associated with burns, right forearm. 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 M61.33 (calcification and ossification of muscles associated with burns, forearm), M61.331 is specifically for calcification and ossification of muscles associated with burns, right forearm. Related codes cover left forearm (M61.332) and unspecified forearm (M61.339).

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 728.19 (other muscular calcification and ossification).

Notes that apply from higher levels

Instructions written at a parent level also apply to M61.331.

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 →
  • 728.19Other muscular calcification and ossificationapproximate

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 M61.331

Is M61.331 billable?

Yes. M61.331 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can M61.331 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict M61.331 as a principal diagnosis.

Is M61.331 a CC or MCC?

No. M61.331 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does M61.331 group to?

M61.331 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 M61.331?

The CMS General Equivalence Mappings map M61.331 to ICD-9-CM 728.19.