Is ICD-10-CM code B99 billable?

No, B99 (Other and unspecified infectious diseases) 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 B99 belong to?

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

B99Non-billable

Other and unspecified infectious diseases

Certain Infectious and Parasitic Diseases·category·FY 2026

Use a more specific code (2 billable)

B99.8Other infectious disease B99.9Unspecified infectious disease

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.-)

Clinical Hierarchy

BillableHas subcodes

CH1Certain infectious and parasitic diseases (A00-B99)

B99Other and unspecified infectious diseasesNot billable

B99.8Other infectious diseaseBillable

B99.9Unspecified infectious diseaseBillable

MS-DRG Classification

2026

No direct MS-DRG triggers identified.