ICD-10-CM 2027
ICD-10 code for Forestier's disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › Forestier's (rhizomelic pseudopolyarthritis)”. Page updated September 29, 2026.
About coding Forestier's disease
The ICD-10-CM code for Forestier's disease is M35.3 (Polymyalgia rheumatica).
Within M35 (other systemic involvement of connective tissue), M35.3 is specifically for polymyalgia rheumatica. Related codes cover Sjogren syndrome (M35.0), other overlap syndromes (M35.1), Behcet's disease (M35.2), diffuse (eosinophilic) fasciitis (M35.4), multifocal fibrosclerosis (M35.5), relapsing panniculitis [Weber-Christian] (M35.6), hypermobility syndrome (M35.7), other specified systemic involvement of connective tissue (M35.8) and 1 more.
Don't report M35.3 together with the conditions in its Excludes1 note: polymyalgia rheumatica with giant cell arteritis (M31.5).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific Forestier's disease codes (official index)
- meaning ankylosing hyperostosis
Don't confuse with (Excludes1 for M35.3)
- polymyalgia rheumatica with giant cell arteritis (M31.5)
Common questions about Forestier's disease ICD-10 codes
What is the ICD-10 code for Forestier's disease?
- M35.3 — Polymyalgia rheumatica.
Is M35.3 billable?
- Yes. M35.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M35.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M35.3 as a principal diagnosis.
Is M35.3 a CC or MCC?
- No. M35.3 is neither a CC nor an MCC under MS-DRG v44.0.