M00.161 Pneumococcal arthritis, right knee

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from M00 Pyogenic arthritis

Excludes2 (not included here)

• infection and inflammatory reaction due to internal joint prosthesis (T84.5-)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 92 — Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis
• CMS-HCC V22: HCC 39 — Bone/Joint/Muscle Infections/Necrosis
• ESRD V24: HCC 39

MS-DRG index

Defines the logic of DRG(s) 485-487 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 041.2 Pneumococcus infection in conditions classified elsewhere and of unspecified site (approximate)
• 711.06 Pyogenic arthritis, lower leg (approximate)

Nearby codes

• M00.15 Pneumococcal arthritis, hip
• M00.151 Pneumococcal arthritis, right hip
• M00.152 Pneumococcal arthritis, left hip
• M00.159 Pneumococcal arthritis, unspecified hip
• M00.16 Pneumococcal arthritis, knee
• M00.161 Pneumococcal arthritis, right knee (this code)
• M00.162 Pneumococcal arthritis, left knee
• M00.169 Pneumococcal arthritis, unspecified knee
• M00.17 Pneumococcal arthritis, ankle and foot
• M00.171 Pneumococcal arthritis, right ankle and foot
• M00.172 Pneumococcal arthritis, left ankle and foot