ICD-10-CM 2027
ICD-10 code for Sacroiliitis NEC
From the official ICD-10-CM alphabetic index entry “Sacroiliitis NEC”. Page updated September 29, 2026.
About coding Sacroiliitis NEC
The ICD-10-CM code for Sacroiliitis NEC is M46.1 (Sacroiliitis, not elsewhere classified).
Within M46 (other inflammatory spondylopathies), M46.1 is specifically for Sacroiliitis, not elsewhere classified. Related codes cover spinal enthesopathy (M46.0), osteomyelitis of vertebra (M46.2), infection of intervertebral disc (pyogenic) (M46.3), Discitis, unspecified (M46.4), other infective spondylopathies (M46.5), other specified inflammatory spondylopathies (M46.8) and unspecified inflammatory spondylopathy (M46.9).
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 551 (Medical Back Problems with MCC, relative weight 1.6358) and DRG 552 (Medical Back Problems without MCC, relative weight 0.9584), 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 Sacroiliitis NEC ICD-10 codes
What is the ICD-10 code for Sacroiliitis NEC?
- M46.1 — Sacroiliitis, not elsewhere classified.
Is M46.1 billable?
- Yes. M46.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M46.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M46.1 as a principal diagnosis.
Is M46.1 a CC or MCC?
- No. M46.1 is neither a CC nor an MCC under MS-DRG v44.0.