ICD-10-CM Code For Infection Due To Other Mycobacteria: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group A31 includes infections caused by non-tuberculous mycobacteria such as Mycobacterium avium complex and other atypical mycobacterial species, covering pulmonary, cutaneous, lymphatic, and disseminated presentations. These ICD-10-CM diagnosis codes are used to document clinical scenarios including localized versus disseminated disease, specific organ involvement, and treatment-related complications, capturing disease severity, organ involvement, or clinical complexity relevant to this group. Accurate coding within the ICD-10-CM A31 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

Customize your policy alerts

Sign up for ICD-10-CM Code For Infection Due To Other Mycobacteria: Group Overview policy alerts

Get alerted when relevant policies change without checking for updates manually.

Monitor payer policy activity

Receive email alerts as soon as relevant payer policies are published or updated.

ICD-10-CM A31: Infection Due To Other Mycobacteria Overview

The ICD-10-CM A31 code group represents infections caused by non-tuberculous mycobacteria, affecting skin, soft tissue, lungs, lymph nodes, or disseminated systems. These infections target multiple body systems, often presenting with chronic localized or systemic disease. Accurate coding matters for appropriate reimbursement and to reflect clinical complexity for claims processing.

When to Use

Use codes from this group when a clinician documents infection due to non-tuberculous mycobacteria with specified anatomic site or disseminated disease. Select the most specific code available to reflect organism, site, and whether the infection is localized or disseminated for accurate clinical and billing records.

ICD-10-CM Codes

5 rows

ICD-10-CM Code	Description
A31.0	Pulmonary mycobacterial infection
A31.1	Cutaneous mycobacterial infection
A31.2	Disseminated mycobacterium avium-intracellulare complex (DMAC)
A31.8	Other mycobacterial infections
A31.9	Mycobacterial infection, unspecified

DRG Codes

11 rows

DRG Code	Description
177	Respiratory Infections and Inflammations with MCC
178	Respiratory Infections and Inflammations with CC
179	Respiratory Infections and Inflammations without CC/MCC
606	Minor Skin Disorders with MCC
607	Minor Skin Disorders without MCC
867	Other Infectious and Parasitic Diseases Diagnoses with MCC
868	Other Infectious and Parasitic Diseases Diagnoses with CC
869	Other Infectious and Parasitic Diseases Diagnoses without CC/MCC
974	HIV with Major Related Condition with MCC
975	HIV with Major Related Condition with CC
976	HIV with Major Related Condition without CC/MCC

Typical Clinical Scenarios

An adult with progressive nodular skin lesions and draining sinuses after exposure to contaminated soil presents to dermatology with chronic, non-healing cutaneous nodules and subcutaneous abscesses. Tissue biopsy and culture grow nontuberculous mycobacteria species causing primary cutaneous infection, and the clinician assigns a code reflecting cutaneous mycobacterial infection. Typical codes: A31.0, A31.9
An elderly patient with long-standing bronchiectasis and chronic cough is admitted for worsening purulent sputum and systemic symptoms; respiratory cultures isolate Mycobacterium avium complex consistent with pulmonary mycobacterial disease. Because the infection involves the lower respiratory tract and requires targeted antimicrobial therapy, a pulmonary-specific mycobacterial infection code is assigned. Typical codes: A31.1, A31.9
A patient with human immunodeficiency virus (HIV) presents with disseminated fever, weight loss, hepatosplenomegaly, and positive blood cultures for atypical mycobacteria indicating disseminated infection as an opportunistic complication. Given multisystem involvement from non-tuberculous mycobacteria in an immunocompromised host, a disseminated mycobacterial infection code is used to capture the comorbidity and guide care coordination. Typical codes: A31.2, A31.9

Related Codes

A30-LEPROSY-HANSEN-S-DISEASE

ICD-10-CM Code For Leprosy Hansen's Disease: Group Overview

A32-LISTERIOSIS

ICD-10-CM Code For Listeriosis: Group Overview

A33-TETANUS-NEONATORUM

ICD-10-CM Code For Tetanus Neonatorum: Group Overview

A34-OBSTETRICAL-TETANUS

ICD-10-CM Code For Obstetrical Tetanus: Group Overview

A35-OTHER-TETANUS

ICD-10-CM Code For Other Tetanus: Group Overview

A36-DIPHTHERIA

ICD-10-CM Code For Diphtheria: Group Overview

A37-WHOOPING-COUGH

ICD-10-CM Code For Whooping Cough: Group Overview

A38-SCARLET-FEVER

ICD-10-CM Code For Scarlet Fever: Group Overview

A39-MENINGOCOCCAL-INFECTION

ICD-10-CM Code For Meningococcal Infection: Group Overview

A41-OTHER-SEPSIS

ICD-10-CM Code For Other Sepsis: Group Overview

Showing 1–10 of 16

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Explore openpayer tools

View all tools

When to Use

ICD-10-CM Codes

5 rows

ICD-10-CM Code	Description
A31.0	Pulmonary mycobacterial infection
A31.1	Cutaneous mycobacterial infection
A31.2	Disseminated mycobacterium avium-intracellulare complex (DMAC)
A31.8	Other mycobacterial infections
A31.9	Mycobacterial infection, unspecified

DRG Codes

11 rows

DRG Code	Description
177	Respiratory Infections and Inflammations with MCC
178	Respiratory Infections and Inflammations with CC
179	Respiratory Infections and Inflammations without CC/MCC
606	Minor Skin Disorders with MCC
607	Minor Skin Disorders without MCC
867	Other Infectious and Parasitic Diseases Diagnoses with MCC
868	Other Infectious and Parasitic Diseases Diagnoses with CC
869	Other Infectious and Parasitic Diseases Diagnoses without CC/MCC
974	HIV with Major Related Condition with MCC
975	HIV with Major Related Condition with CC
976	HIV with Major Related Condition without CC/MCC

Typical Clinical Scenarios

An adult with progressive nodular skin lesions and draining sinuses after exposure to contaminated soil presents to dermatology with chronic, non-healing cutaneous nodules and subcutaneous abscesses. Tissue biopsy and culture grow nontuberculous mycobacteria species causing primary cutaneous infection, and the clinician assigns a code reflecting cutaneous mycobacterial infection. Typical codes: A31.0, A31.9
An elderly patient with long-standing bronchiectasis and chronic cough is admitted for worsening purulent sputum and systemic symptoms; respiratory cultures isolate Mycobacterium avium complex consistent with pulmonary mycobacterial disease. Because the infection involves the lower respiratory tract and requires targeted antimicrobial therapy, a pulmonary-specific mycobacterial infection code is assigned. Typical codes: A31.1, A31.9
A patient with human immunodeficiency virus (HIV) presents with disseminated fever, weight loss, hepatosplenomegaly, and positive blood cultures for atypical mycobacteria indicating disseminated infection as an opportunistic complication. Given multisystem involvement from non-tuberculous mycobacteria in an immunocompromised host, a disseminated mycobacterial infection code is used to capture the comorbidity and guide care coordination. Typical codes: A31.2, A31.9

Related Codes

A30-LEPROSY-HANSEN-S-DISEASE

ICD-10-CM Code For Leprosy Hansen's Disease: Group Overview

A32-LISTERIOSIS

ICD-10-CM Code For Listeriosis: Group Overview

A33-TETANUS-NEONATORUM

ICD-10-CM Code For Tetanus Neonatorum: Group Overview

A34-OBSTETRICAL-TETANUS

ICD-10-CM Code For Obstetrical Tetanus: Group Overview

A35-OTHER-TETANUS

ICD-10-CM Code For Other Tetanus: Group Overview

A36-DIPHTHERIA

ICD-10-CM Code For Diphtheria: Group Overview

A37-WHOOPING-COUGH

ICD-10-CM Code For Whooping Cough: Group Overview

A38-SCARLET-FEVER

ICD-10-CM Code For Scarlet Fever: Group Overview

A39-MENINGOCOCCAL-INFECTION

ICD-10-CM Code For Meningococcal Infection: Group Overview

A41-OTHER-SEPSIS

ICD-10-CM Code For Other Sepsis: Group Overview

Showing 1–10 of 16

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Infection Due To Other Mycobacteria: Group Overview

Sign up for ICD-10-CM Code For Infection Due To Other Mycobacteria: Group Overview policy alerts

ICD-10-CM A31: Infection Due To Other Mycobacteria Overview

ICD-10-CM Code For Infection Due To Other Mycobacteria: Group Overview

Sign up for ICD-10-CM Code For Infection Due To Other Mycobacteria: Group Overview policy alerts

ICD-10-CM A31: Infection Due To Other Mycobacteria Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-CM codes are included in the A31 group for infection due to other mycobacteria?

How does accurate coding within the A31 group affect claims and reimbursement?

What clinical presentations are represented by the A31 code group?

Which DRGs may be related to diagnoses coded from the A31 group?

When should a coder use `A31.9` instead of a more specific A31 code?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-CM codes are included in the A31 group for infection due to other mycobacteria?

How does accurate coding within the A31 group affect claims and reimbursement?

What clinical presentations are represented by the A31 code group?

Which DRGs may be related to diagnoses coded from the A31 group?

When should a coder use `A31.9` instead of a more specific A31 code?

References