ICD-10-CM 2027
ICD-10 code for Felty's syndrome
From the official ICD-10-CM alphabetic index entry “Felty's syndrome”. Page updated September 29, 2026.
About coding Felty's syndrome
The ICD-10-CM code for Felty's syndrome is M05.00 (Felty's syndrome, 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 M05.00.
Within M05.0, choose M05.00 (unspecified site) only when documentation doesn't support a more specific option: shoulder (M05.01), elbow (M05.02), wrist (M05.03), hand (M05.04), hip (M05.05), knee (M05.06), ankle and foot (M05.07) and multiple sites (M05.09).
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 Felty's syndrome codes (official index)
- ankle M05.07 — Felty's syndrome, ankle and foot
- elbow M05.02 — Felty's syndrome, elbow
- foot joint M05.07 — Felty's syndrome, ankle and foot
- hand joint M05.04 — Felty's syndrome, hand
- hip M05.05 — Felty's syndrome, hip
- knee M05.06 — Felty's syndrome, knee
- multiple site M05.09 — Felty's syndrome, multiple sites
- shoulder M05.01 — Felty's syndrome, shoulder
- vertebra
- wrist M05.03 — Felty's syndrome, wrist
Common questions about Felty's syndrome ICD-10 codes
What is the ICD-10 code for Felty's syndrome?
- M05.00 — Felty's syndrome, unspecified site. More specific codes apply when the documentation supports them: M05.07, M05.02, M05.07, M05.04 and others below.
What is the ICD-10 code for ankle felty's syndrome?
- M05.07 — Felty's syndrome, ankle and foot (header code; choose a more specific subcode).
What is the ICD-10 code for elbow felty's syndrome?
- M05.02 — Felty's syndrome, elbow (header code; choose a more specific subcode).
What is the ICD-10 code for foot joint felty's syndrome?
- M05.07 — Felty's syndrome, ankle and foot (header code; choose a more specific subcode).
What is the ICD-10 code for hand joint felty's syndrome?
- M05.04 — Felty's syndrome, hand (header code; choose a more specific subcode).
What is the ICD-10 code for hip felty's syndrome?
- M05.05 — Felty's syndrome, hip (header code; choose a more specific subcode).
What is the ICD-10 code for knee felty's syndrome?
- M05.06 — Felty's syndrome, knee (header code; choose a more specific subcode).
Is M05.00 billable?
- Yes. M05.00 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M05.00 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M05.00 as a principal diagnosis.
Is M05.00 a CC or MCC?
- No. M05.00 is neither a CC nor an MCC under MS-DRG v44.0.