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ICD-10-CM 2027 diagnosis code

M06.4Inflammatory polyarthropathy

✓ Billable / specific

M06.4 is a valid, billable ICD-10-CM code for inflammatory polyarthropathy. 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 M06.4

M06.4 is the ICD-10-CM diagnosis code for inflammatory polyarthropathy. It belongs to category M06 (other rheumatoid arthritis), block M05-M14 (inflammatory polyarthropathies) 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 M06 (other rheumatoid arthritis), M06.4 is specifically for inflammatory polyarthropathy. Related codes cover rheumatoid arthritis without rheumatoid factor (M06.0), Adult-onset Still's disease (M06.1), rheumatoid bursitis (M06.2), rheumatoid nodule (M06.3), other specified rheumatoid arthritis (M06.8) and rheumatoid arthritis, unspecified (M06.9).

Don't report M06.4 together with the conditions in its Excludes1 note: polyarthritis NOS (M13.0).

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 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 714.89 (other specified inflammatory polyarthropathies) and 714.9 (unspecified inflammatory polyarthropathy).

Coding notes

Excludes1Not coded here — never report together with this code
  • polyarthritis NOS (M13.0)

Notes that apply from higher levels

Instructions written at a parent level also apply to M06.4.

Broader instructions also apply from 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 M06.4.

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 →
  • 714.89Other specified inflammatory polyarthropathiesapproximate
  • 714.9Unspecified inflammatory polyarthropathyapproximate

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 M06.4

Is M06.4 billable?

Yes. M06.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can M06.4 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict M06.4 as a principal diagnosis.

Is M06.4 a CC or MCC?

No. M06.4 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does M06.4 group to?

M06.4 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.

What is the ICD-9 code for M06.4?

The CMS General Equivalence Mappings map M06.4 to ICD-9-CM 714.89 and 714.9.