ICD-10-CM 2027
ICD-10 code for tularemia
From the official ICD-10-CM alphabetic index entry “Tularemia”. Page updated September 29, 2026.
About coding tularemia
The ICD-10-CM code for tularemia is A21.9 (Tularemia, unspecified). The official index lists 19 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on A21.9.
Within A21, choose A21.9 (unspecified) only when documentation doesn't support a more specific option: Ulceroglandular tularemia (A21.0), Oculoglandular tularemia (A21.1), pulmonary tularemia (A21.2), gastrointestinal tularemia (A21.3), generalized tularemia (A21.7) and other forms of tularemia (A21.8).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 867 (Other Infectious and Parasitic Diseases Diagnoses with MCC, relative weight 2.1859), DRG 868 (Other Infectious and Parasitic Diseases Diagnoses with CC, relative weight 1.0235) and DRG 869 (Other Infectious and Parasitic Diseases Diagnoses without CC/MCC, relative weight 0.6787), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific tularemia codes (official index)
- with
- conjunctivitis A21.1 — Oculoglandular tularemia
- pneumonia A21.2 — Pulmonary tularemia
- abdominal A21.3 — Gastrointestinal tularemia
- bronchopneumonic A21.2 — Pulmonary tularemia
- conjunctivitis A21.1 — Oculoglandular tularemia
- cryptogenic A21.3 — Gastrointestinal tularemia
- enteric A21.3 — Gastrointestinal tularemia
- gastrointestinal A21.3 — Gastrointestinal tularemia
- generalized A21.7 — Generalized tularemia
- ingestion A21.3 — Gastrointestinal tularemia
- intestinal A21.3 — Gastrointestinal tularemia
- oculoglandular A21.1 — Oculoglandular tularemia
- ophthalmic A21.1 — Oculoglandular tularemia
- pneumonia (any), pneumonic A21.2 — Pulmonary tularemia
- pulmonary A21.2 — Pulmonary tularemia
- sepsis A21.7 — Generalized tularemia
- specified NEC A21.8 — Other forms of tularemia
- typhoidal A21.7 — Generalized tularemia
- ulceroglandular A21.0 — Ulceroglandular tularemia
Common questions about tularemia ICD-10 codes
What is the ICD-10 code for tularemia?
- A21.9 — Tularemia, unspecified. More specific codes apply when the documentation supports them: A21.1, A21.2, A21.3, A21.2 and others below.
What is the ICD-10 code for abdominal tularemia?
- A21.3 — Gastrointestinal tularemia.
What is the ICD-10 code for bronchopneumonic tularemia?
- A21.2 — Pulmonary tularemia.
What is the ICD-10 code for conjunctivitis tularemia?
- A21.1 — Oculoglandular tularemia.
What is the ICD-10 code for cryptogenic tularemia?
- A21.3 — Gastrointestinal tularemia.
What is the ICD-10 code for enteric tularemia?
- A21.3 — Gastrointestinal tularemia.
What is the ICD-10 code for gastrointestinal tularemia?
- A21.3 — Gastrointestinal tularemia.
Is A21.9 billable?
- Yes. A21.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A21.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A21.9 as a principal diagnosis.
Is A21.9 a CC or MCC?
- A21.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.