A22.1 Pulmonary anthrax

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

Applicable to

• Inhalation anthrax
• Ragpicker's disease
• Woolsorter's disease

Applies from A22 Anthrax

Includes

• infection due to Bacillus anthracis

Risk adjustment (HCC)

• CMS-HCC V22: HCC 115 — Pneumococcal Pneumonia, Empyema, Lung Abscess
• ESRD V24: HCC 115

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 022.1 Pulmonary anthrax (approximate)
• 022.1 Pulmonary anthrax (approximate)
• 484.5 Pneumonia in anthrax (approximate)

Code annotations containing back-references to A22.1

Back-references to A22.1

• Type 1 Excludes: J17 Pneumonia in diseases classified elsewhere ("pneumonia in anthrax (A22.1)")

Diagnosis Index entries for A22.1

• Anthrax › with pneumonia
• Anthrax › inhalation
• Anthrax › pulmonary
• Anthrax › respiratory
• Disease, diseased › ragpicker's or ragsorter's
• Disease, diseased › woolsorter's
• Inhalation › anthrax
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › anthrax
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › in (due to) › anthrax
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › in (due to) › Bacillus anthracis
• Ragpicker's disease
• Ragsorter's disease
• Woolsorter's disease

Nearby codes

• A22 Anthrax
• A22.0 Cutaneous anthrax
• A22.1 Pulmonary anthrax (this code)
• A22.2 Gastrointestinal anthrax
• A22.7 Anthrax sepsis
• A22.8 Other forms of anthrax
• A22.9 Anthrax, unspecified