What does ICD-10 code A77.41 mean?

ICD-10 code A77.41 is the standardized code used for ehrlichiosis chaffeensis [e. chaffeensis] in medical records and coding systems.

When is ICD-10 code A77.41 used?

Doctors, hospitals, and insurers may use ICD-10 code A77.41 when recording ehrlichiosis chaffeensis [e. chaffeensis] in a standardized format.

Does ICD-10 code A77.41 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10BillableValid for clinical use

ICD-10 Code A77.41: Ehrlichiosis chaffeensis [E. chaffeensis]

Name: ICD-10 Code A77.41: Ehrlichiosis chaffeensis [E. chaffeensis]
Creator: HealthAssure Clinical Team
Published: 2026-05-26T12:46:38.762Z

A77.41 is a billable ICD-10 diagnosis code used to classify Ehrlichiosis chaffeensis [E. chaffeensis] in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

When is it used?

May be used when a clinician documents ehrlichiosis chaffeensis [e. chaffeensis] in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter

1Certain infectious and parasitic diseases (A00-B99)

block

A75-A79Rickettsioses

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

Infectious Disease SpecialistGeneral Physician

Sibling codes

A77.40Ehrlichiosis, unspecifiedbillable A77.49Other ehrlichiosisbillable

Coverage-related procedures and services

CPT 0595Uhigh

INFECTIOUS DISEASE (TROPICAL FEVER PATHOGENS), VECTOR-BORNE AND ZOONOTIC PATHOGENS, INCLUDING 2 VIRUSES (CHIKUNGUNYA VIRUS AND DENGUE VIRUS SEROTYPES 1, 2, 3, AND 4), 1 BACTERIUM (LEPTOSPIRA SPECIES), AND 1 PARASITE WITH SPECIES DIFFERENTIATION (PLASMODIUM SPECIES, PLASMODIUM FALCIPARUM, AND PLASMODIUM VIVAX/OVALE), REAL-TIME RT-PCR, WHOLE BLOOD, EACH PATHOGEN REPORTED AS DETECTED OR NOT DETECTED

Source: CMS coverage guidance

CPT 87999high

UNLISTED MICROBIOLOGY PROCEDURE

Source: CMS coverage guidance

Coding guidelines

Common synonyms

Ehrlichiosis chaffeensis [E. chaffeensis]

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.