B59 Pneumocystosis

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

Applicable to

• Pneumonia due to Pneumocystis carinii
• Pneumonia due to Pneumocystis jirovecii

Applies from B59 Pneumocystosis

Applicable to

• Pneumonia due to Pneumocystis carinii
• Pneumonia due to Pneumocystis jirovecii

Risk adjustment (HCC)

• CMS-HCC V28: HCC 6 — Opportunistic Infections
• CMS-HCC V22: HCC 6 — Opportunistic Infections
• RxHCC V08: HCC 5 — Opportunistic Infections
• ESRD V24: HCC 6

MS-DRG index

Defines the logic of DRG(s) 177-179 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 136.3 Pneumocystosis

Code annotations containing back-references to B59

Back-references to B59

• Type 1 Excludes: J16 Pneumonia due to other infectious organisms, not elsewhere classified ("pneumocystosis (B59)")
• Type 1 Excludes: J17 Pneumonia in diseases classified elsewhere ("pneumocystosis (B59)")
• Type 1 Excludes: J17 Pneumonia in diseases classified elsewhere ("pneumonia due to Pneumocystis carinii (B59)")
• Type 1 Excludes: J17 Pneumonia in diseases classified elsewhere ("pneumonia due to Pneumocystis jirovecii (B59)")
• Type 2 Excludes: J82 Pulmonary eosinophilia, not elsewhere classified ("pulmonary eosinophilia due to specified parasitic infection (B50-B83)")
• Type 1 Excludes: J84.11 Idiopathic interstitial pneumonia ("pneumocystis pneumonia (B59)")
• Type 1 Excludes: J84.114 Acute interstitial pneumonitis ("pneumocystis pneumonia (B59)")
• Code First: J93.12 Secondary spontaneous pneumothorax ("pneumonia due to Pneumocystis carinii (B59)")

Back-references to B59

• Type 1 Excludes: J16 Pneumonia due to other infectious organisms, not elsewhere classified ("pneumocystosis (B59)")
• Type 1 Excludes: J17 Pneumonia in diseases classified elsewhere ("pneumocystosis (B59)")
• Type 1 Excludes: J17 Pneumonia in diseases classified elsewhere ("pneumonia due to Pneumocystis carinii (B59)")
• Type 1 Excludes: J17 Pneumonia in diseases classified elsewhere ("pneumonia due to Pneumocystis jirovecii (B59)")
• Type 2 Excludes: J82 Pulmonary eosinophilia, not elsewhere classified ("pulmonary eosinophilia due to specified parasitic infection (B50-B83)")
• Type 1 Excludes: J84.11 Idiopathic interstitial pneumonia ("pneumocystis pneumonia (B59)")
• Type 1 Excludes: J84.114 Acute interstitial pneumonitis ("pneumocystis pneumonia (B59)")
• Code First: J93.12 Secondary spontaneous pneumothorax ("pneumonia due to Pneumocystis carinii (B59)")

Diagnosis Index entries for B59

• Disease, diseased › protozoal › pneumocystosis
• Infection, infected, infective (opportunistic) › Pneumocystis carinii (pneumonia)
• Infection, infected, infective (opportunistic) › Pneumocystis jirovecii (pneumonia)
• Pneumocystis carinii pneumonia
• Pneumocystis jirovecii (pneumonia)
• Pneumocystosis (with pneumonia)
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › in (due to) › pneumocystosis (Pneumocystis carinii) (Pneumocystis jirovecii)
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › interstitial › plasma cell
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › plasma cell (of infants)
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › Pneumocystis (carinii) (jirovecii)

Nearby codes

• B59 Pneumocystosis (this code)