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ICD-10-CM 2027 diagnosis code

M62.5A9Muscle wasting and atrophy, not elsewhere classified, back, unspecified level

✓ Billable / specific

M62.5A9 is a valid, billable ICD-10-CM code for muscle wasting and atrophy, not elsewhere classified, back, unspecified level. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Muscle wasting and atrophy, NEC, back, unspecified level

Code last changed in FY2023 (effective October 1, 2022). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About M62.5A9

M62.5A9 is the ICD-10-CM diagnosis code for muscle wasting and atrophy, not elsewhere classified, back, unspecified level. It belongs to category M62 (other disorders 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 M62.5A, choose M62.5A9 (unspecified level) only when documentation doesn't support a more specific option: cervical (M62.5A0), thoracic (M62.5A1) and lumbosacral (M62.5A2).

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 was added in FY2023, effective October 1, 2022.

Notes that apply from higher levels

Instructions written at a parent level also apply to M62.5A9.

› From M62.5 Muscle wasting and atrophy, not elsewhere classified
Excludes1
Excludes2
  • pelvic muscle wasting (N81.84)
› From M62 Other disorders of muscle
Excludes1
Excludes2
  • nontraumatic hematoma of muscle (M79.81)

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

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to M62.5A9.

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

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
  • FY2023 (effective 10/1/2022): Added
  • No changes since FY2023.

Common questions about M62.5A9

Is M62.5A9 billable?

Yes. M62.5A9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can M62.5A9 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict M62.5A9 as a principal diagnosis.

Is M62.5A9 a CC or MCC?

No. M62.5A9 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does M62.5A9 group to?

M62.5A9 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.