ICD-10-CM 2027
ICD-10 code for Dyscollagenosis
From the official ICD-10-CM alphabetic index entry “Dyscollagenosis”. Page updated September 29, 2026.
About coding Dyscollagenosis
The ICD-10-CM code for Dyscollagenosis is M35.9 (Systemic involvement of connective tissue, unspecified).
Within M35, choose M35.9 (Systemic involvement of connective tissue, unspecified) only when documentation doesn't support a more specific option: Sjogren syndrome (M35.0), other overlap syndromes (M35.1), Behcet's disease (M35.2), polymyalgia rheumatica (M35.3), diffuse (eosinophilic) fasciitis (M35.4), multifocal fibrosclerosis (M35.5), relapsing panniculitis [Weber-Christian] (M35.6), hypermobility syndrome (M35.7) and 1 more.
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 Dyscollagenosis ICD-10 codes
What is the ICD-10 code for Dyscollagenosis?
- M35.9 — Systemic involvement of connective tissue, unspecified.
Is M35.9 billable?
- Yes. M35.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M35.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M35.9 as a principal diagnosis.
Is M35.9 a CC or MCC?
- No. M35.9 is neither a CC nor an MCC under MS-DRG v44.0.