A20.9 Plague, unspecified

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

Applies from A20 Plague

Includes

• infection due to Yersinia pestis

MS-DRG index

Defines the logic of DRG(s) 867-869 in MDC 18.

Approximate ICD-9-CM (GEMs)

• 020.9 Plague, unspecified

Code annotations containing back-references to A20.9

Back-references to A20

• Type 1 Excludes: A28.2 Extraintestinal yersiniosis ("plague (A20.-)")

Diagnosis Index entries for A20.9

• Black › death
• Plague

Nearby codes

• A20.1 Cellulocutaneous plague
• A20.2 Pneumonic plague
• A20.3 Plague meningitis
• A20.7 Septicemic plague
• A20.8 Other forms of plague
• A20.9 Plague, unspecified (this code)