Is ICD-10-CM code A21 billable?

No, A21 (Tularemia) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code A21 belong to?

A21 belongs to Chapter 1 of the ICD-10-CM tabular list: A00–B99 (Certain Infectious and Parasitic Diseases).

A21

Non-Billable

ChapterA00–B99

Rankcategory

Description

Tularemia

About ICD-10-CM code A21

A21 is the ICD-10-CM diagnosis code for Tularemia. It sits in A00-B99 Certain Infectious and Parasitic Diseases, within Certain zoonotic bacterial diseases (A20-A28). A21 is not billable on its own, coders must choose one of its more specific child codes instead.

Use a more specific code (7 billable)

A21.0Ulceroglandular tularemia A21.1Oculoglandular tularemia A21.2Pulmonary tularemia A21.3Gastrointestinal tularemia A21.7Generalized tularemia A21.8Other forms of tularemia A21.9Tularemia, unspecified

Metadata & Insights

•Non-billable category (requires more specific sub-code).
•Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

CH1 Parent Instructions

Includes

diseases generally recognized as communicable or transmissible

Excludes1(Not coded here. Use a different code.)

certain localized infections - see body system-related chapters

Excludes2(Not included here. Code separately if applicable.)

carrier or suspected carrier of infectious disease (Z22.-)
infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
infectious and parasitic diseases specific to the perinatal period (P35-P39)
influenza and other acute respiratory infections (J00-J22)

Use Additional Code

code to identify resistance to antimicrobial drugs (Z16.-)

Instructional Notes

Includes

deer-fly fever
infection due to Francisella tularensis
rabbit fever

Clinical Hierarchy

BillableHas subcodes

CH1Certain infectious and parasitic diseases (A00-B99)

A20-A28Certain zoonotic bacterial diseases (A20-A28)

A21TularemiaNot billable

A21.0Ulceroglandular tularemiaBillable

A21.1Oculoglandular tularemiaBillable

A21.2Pulmonary tularemiaBillable

A21.3Gastrointestinal tularemiaBillable

A21.7Generalized tularemiaBillable

A21.8Other forms of tularemiaBillable

A21.9Tularemia, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A21:

chapterCH1

Certain infectious and parasitic diseases (A00-B99)

View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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