Actinomycosis (A42) ICD-10-CM
The A42 code range covers actinomycosis with 10 ICD-10-CM diagnosis codes. 8 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- actinomycetoma B47.1
Codes in the A42 Range 10 codes · 8 billable
- A42 ActinomycosisNon-billable
- A42.0 Pulmonary actinomycosis
- A42.1 Abdominal actinomycosis
- A42.2 Cervicofacial actinomycosis
- A42.7 Actinomycotic sepsis
- A42.8 Other forms of actinomycosisNon-billable
- A42.81 Actinomycotic meningitis
- A42.82 Actinomycotic encephalitis
- A42.89 Other forms of actinomycosis
- A42.9 Actinomycosis, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the A42 range.
Actinomycosis
Infections with bacteria of the genus ACTINOMYCES.
Actinomycosis, Cervicofacial
A form of ACTINOMYCOSIS characterized by slow-growing inflammatory lesions of the lymph nodes that drain the mouth (lumpy jaw), reddening of the overlying skin, and intraperitoneal abscesses.
About the A42 Code Range
Actinomycosis is an infection caused by Actinomyces bacteria. Its codes distinguish where the infection occurs and identify sepsis and other forms.
A42.0 identifies the lung form, A42.1 the abdominal form, and A42.2 the face-and-neck form. A42.7 identifies actinomycotic sepsis.
The other-forms branch, A42.8, separates meningitis, encephalitis, and other forms. A42.9 identifies unspecified actinomycosis.
Questions About This Page
How many billable codes are in the A42 range?
Of the 10 codes in this range, 8 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the A42 range classify?
The range classifies actinomycosis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
