ICD-10-CM 2027
ICD-10 code for carditis rheumatoid
From the official ICD-10-CM alphabetic index entry “Rheumatoid › carditis”. Page updated September 29, 2026.
About coding carditis rheumatoid
The ICD-10-CM code for carditis rheumatoid is M05.30 (Rheumatoid heart disease with rheumatoid arthritis of unspecified site). The official index lists 9 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M05.30.
Within M05.3, choose M05.30 (of unspecified site) only when documentation doesn't support a more specific option: of shoulder (M05.31), of elbow (M05.32), of wrist (M05.33), of hand (M05.34), of hip (M05.35), of knee (M05.36), of ankle and foot (M05.37) and of multiple sites (M05.39).
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 545 (Connective Tissue Disorders with MCC, relative weight 2.3892), DRG 546 (Connective Tissue Disorders with CC, relative weight 1.1745) and DRG 547 (Connective Tissue Disorders without CC/MCC, relative weight 0.7526), 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.
More specific carditis rheumatoid codes (official index)
- ankle M05.37 — Rheumatoid heart disease with rheumatoid arthritis of ankle and foot
- elbow M05.32 — Rheumatoid heart disease with rheumatoid arthritis of elbow
- foot joint M05.37 — Rheumatoid heart disease with rheumatoid arthritis of ankle and foot
- hand joint M05.34 — Rheumatoid heart disease with rheumatoid arthritis of hand
- hip M05.35 — Rheumatoid heart disease with rheumatoid arthritis of hip
- knee M05.36 — Rheumatoid heart disease with rheumatoid arthritis of knee
- multiple site M05.39 — Rheumatoid heart disease with rheumatoid arthritis of multiple sites
- shoulder M05.31 — Rheumatoid heart disease with rheumatoid arthritis of shoulder
- vertebra
- wrist M05.33 — Rheumatoid heart disease with rheumatoid arthritis of wrist
Common questions about carditis rheumatoid ICD-10 codes
What is the ICD-10 code for carditis rheumatoid?
- M05.30 — Rheumatoid heart disease with rheumatoid arthritis of unspecified site. More specific codes apply when the documentation supports them: M05.37, M05.32, M05.37, M05.34 and others below.
What is the ICD-10 code for ankle carditis rheumatoid?
- M05.37 — Rheumatoid heart disease with rheumatoid arthritis of ankle and foot (header code; choose a more specific subcode).
What is the ICD-10 code for elbow carditis rheumatoid?
- M05.32 — Rheumatoid heart disease with rheumatoid arthritis of elbow (header code; choose a more specific subcode).
What is the ICD-10 code for foot joint carditis rheumatoid?
- M05.37 — Rheumatoid heart disease with rheumatoid arthritis of ankle and foot (header code; choose a more specific subcode).
What is the ICD-10 code for hand joint carditis rheumatoid?
- M05.34 — Rheumatoid heart disease with rheumatoid arthritis of hand (header code; choose a more specific subcode).
What is the ICD-10 code for hip carditis rheumatoid?
- M05.35 — Rheumatoid heart disease with rheumatoid arthritis of hip (header code; choose a more specific subcode).
What is the ICD-10 code for knee carditis rheumatoid?
- M05.36 — Rheumatoid heart disease with rheumatoid arthritis of knee (header code; choose a more specific subcode).
Is M05.30 billable?
- Yes. M05.30 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M05.30 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M05.30 as a principal diagnosis.
Is M05.30 a CC or MCC?
- No. M05.30 is neither a CC nor an MCC under MS-DRG v44.0.