M00.171 Pneumococcal arthritis, right ankle and foot

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-)

Applies from M00.17 Pneumococcal arthritis, ankle and foot

Applicable to

• Pneumococcal arthritis, tarsus, metatarsus and phalanges

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) 548-550 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 041.2 Pneumococcus infection in conditions classified elsewhere and of unspecified site (approximate)
• 711.07 Pyogenic arthritis, ankle and foot (approximate)

Nearby codes

• M00.16 Pneumococcal arthritis, knee
• M00.161 Pneumococcal arthritis, right knee
• 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 (this code)
• M00.172 Pneumococcal arthritis, left ankle and foot
• M00.179 Pneumococcal arthritis, unspecified ankle and foot
• M00.18 Pneumococcal arthritis, vertebrae
• M00.19 Pneumococcal polyarthritis
• M00.2 Other streptococcal arthritis and polyarthritis