M00.259Other streptococcal arthritis, unspecified hip

M00.259 is the ICD-10-CM diagnosis code for other streptococcal arthritis, unspecified hip. It belongs to category M00 (pyogenic arthritis), block M00-M02 (infectious arthropathies) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within M00.25, choose M00.259 (unspecified hip) only when documentation doesn't support a more specific option: right hip (M00.251) and left hip (M00.252).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 548 (Septic Arthritis with MCC, relative weight 1.9519), DRG 549 (Septic Arthritis with CC, relative weight 1.1435) and DRG 550 (Septic Arthritis without CC/MCC, relative weight 0.8591), 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.

It is an unspecified code for which a more specific option (often laterality) exists, and the Medicare Code Editor flags it for review on inpatient claims.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 041.09 (streptococcus infection in conditions classified elsewhere and of unspecified site, other streptococcus), 711.05 (pyogenic arthritis, pelvic region and thigh) and 711.05 (pyogenic arthritis, pelvic region and thigh).