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