ICD-10-CM 2027
ICD-10 code for lumbar region discitis
From the official ICD-10-CM alphabetic index entry “Discitis, diskitis › lumbar region”. Page updated September 29, 2026.
About coding lumbar region discitis
The ICD-10-CM code for lumbar region discitis is M46.46 (Discitis, unspecified, lumbar region).
Within M46.4 (Discitis, unspecified), M46.46 is specifically for Discitis, unspecified, lumbar region. Related codes cover site unspecified (M46.40), occipito-atlanto-axial region (M46.41), cervical region (M46.42), cervicothoracic region (M46.43), thoracic region (M46.44), thoracolumbar region (M46.45), lumbosacral region (M46.47), sacral and sacrococcygeal region (M46.48) 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 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 lumbar region discitis ICD-10 codes
What is the ICD-10 code for lumbar region discitis?
- M46.46 — Discitis, unspecified, lumbar region.
Is M46.46 billable?
- Yes. M46.46 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M46.46 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M46.46 as a principal diagnosis.
Is M46.46 a CC or MCC?
- No. M46.46 is neither a CC nor an MCC under MS-DRG v44.0.