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ICD-10-CM 2027 diagnosis code

M19.09Primary osteoarthritis, other specified site

✓ Billable / specific

M19.09 is a valid, billable ICD-10-CM code for primary osteoarthritis, other specified site. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2021 (effective October 1, 2020). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About M19.09

M19.09 is the ICD-10-CM diagnosis code for primary osteoarthritis, other specified site. It belongs to category M19 (other and unspecified osteoarthritis), block M15-M19 (osteoarthritis) 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 M19.0, choose M19.09 (osteoarthritis, other specified site) only when documentation doesn't support a more specific option: osteoarthritis, shoulder (M19.01), osteoarthritis, elbow (M19.02), osteoarthritis, wrist (M19.03), osteoarthritis, hand (M19.04) and osteoarthritis ankle and foot (M19.07).

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 553 (Bone Diseases and Arthropathies with MCC, relative weight 1.2494) and DRG 554 (Bone Diseases and Arthropathies without MCC, relative weight 0.8331), 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 FY2021, effective October 1, 2020.

Notes that apply from higher levels

Instructions written at a parent level also apply to M19.09.

› From M19 Other and unspecified osteoarthritis
Excludes1
  • polyarthritis (M15.-)
Excludes2
  • arthrosis of spine (M47.-)
  • hallux rigidus (M20.2)
  • osteoarthritis of spine (M47.-)

Broader instructions also apply from M15-M19 Osteoarthritis and Chapter 13: Diseases of the musculoskeletal system and connective tissue.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to M19.09.

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
  • FY2021 (effective 10/1/2020): Added
  • No changes since FY2021.

Common questions about M19.09

Is M19.09 billable?

Yes. M19.09 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can M19.09 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict M19.09 as a principal diagnosis.

Is M19.09 a CC or MCC?

No. M19.09 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does M19.09 group to?

M19.09 is used in the MS-DRG v44.0 logic for MS-DRG 553 (Bone Diseases and Arthropathies with MCC) and MS-DRG 554 (Bone Diseases and Arthropathies without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.