Is ICD-10-CM code A77 billable?

No, A77 (Spotted fever [tick-borne rickettsioses]) 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 A77 belong to?

A77 belongs to Chapter 1 of the ICD-10-CM tabular list: A00–B99 (Certain Infectious and Parasitic Diseases).

A77

Non-Billable

ChapterA00–B99

Rankcategory

Description

Spotted fever [tick-borne rickettsioses]

About ICD-10-CM code A77

The ICD-10-CM tabular list places Spotted fever [tick-borne rickettsioses] at code A77, inside A00-B99 Certain Infectious and Parasitic Diseases, within Rickettsioses (A75-A79). You should not submit this code on claims since it lacks billing specificity, use a child code.

Use a more specific code (6 billable, 1 non-billable)

A77.0Spotted fever due to Rickettsia rickettsii A77.1Spotted fever due to Rickettsia conorii A77.2Spotted fever due to Rickettsia siberica A77.3Spotted fever due to Rickettsia australis A77.4Ehrlichiosishas subcodes A77.8Other spotted fevers A77.9Spotted fever, 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.-)

Clinical Hierarchy

BillableHas subcodes

CH1Certain infectious and parasitic diseases (A00-B99)

A75-A79Rickettsioses (A75-A79)

A77Spotted fever [tick-borne rickettsioses]Not billable

A77.0Spotted fever due to Rickettsia rickettsiiBillable

A77.1Spotted fever due to Rickettsia conoriiBillable

A77.2Spotted fever due to Rickettsia sibericaBillable

A77.3Spotted fever due to Rickettsia australisBillable

A77.4EhrlichiosisSubcodes

A77.8Other spotted feversBillable

A77.9Spotted fever, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A77:

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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