Other specified and Unspecified are the ICD 10 codes should be always used carefully. When the specific ICD 10 code is available, we are not supposed to report any other specified or unspecified ICD 10 code. Coding for NEC (Not Elsewhere Classified) and NOS (Not otherwise Specified) have specific guidelines in diagnosis coding. Today, we will learn about the unspecified bacterial disease ICD 10 codes which have to be reported for few specific diseases. So, let us checkout the list of these ICD 10 codes.


Unspecified Other bacterial diseases (A30-A49)

A30 Leprosy [Hansen’s disease]

Includes: infection due to Mycobacterium leprae

Excludes1: sequelae of leprosy (B92)

A30.0 Indeterminate leprosy

I leprosy

A30.1 Tuberculoid leprosy

TT leprosy

A30.2 Borderline tuberculoid leprosy

BT leprosy

A30.3 Borderline leprosy

BB leprosy

A30.4 Borderline lepromatous leprosy

BL leprosy

A30.5 Lepromatous leprosy

LL leprosy

A30.8 Other forms of leprosy

A30.9 Leprosy, unspecified

A31 Infection due to other mycobacteria

Excludes2: leprosy (A30.-) tuberculosis (A15-A19)

A31.0 Pulmonary mycobacterial infection

Infection due to Mycobacterium avium

Infection due to Mycobacterium intracellulare [Battey bacillus] Infection due to Mycobacterium kansasii

A31.1 Cutaneous mycobacterial infection

Buruli ulcer

Infection due to Mycobacterium marinum

Infection due to Mycobacterium ulcerans

A31.2 Disseminated mycobacterium avium-intracellulare complex (DMAC)

MAC sepsis

A31.8 Other mycobacterial infections

A31.9 Mycobacterial infection, unspecified

Atypical mycobacterial infection NOS

Mycobacteriosis NOS

A32 Listeriosis

Includes: listerial foodborne infection

Excludes1: neonatal (disseminated) listeriosis (P37.2)

A32.0 Cutaneous listeriosis

A32.1 Listerial meningitis and meningoencephalitis

A32.11 Listerial meningitis

A32.12 Listerial meningoencephalitis

A32.7 Listerial sepsis

A32.8 Other forms of listeriosis

A32.81 Oculoglandular listeriosis

A32.82 Listerial endocarditis

A32.89 Other forms of listeriosis

Listerial cerebral arteritis

A32.9 Listeriosis, unspecified

A33 Tetanus neonatorum

A34 Obstetrical tetanus

A35 Other tetanus

Tetanus NOS

Excludes1: obstetrical tetanus (A34) tetanus neonatorum (A33)

A36 Diphtheria

A36.0 Pharyngeal diphtheria

Diphtheritic membranous angina

Tonsillar diphtheria


A36.1 Nasopharyngeal diphtheria

A36.2 Laryngeal diphtheria

Diphtheritic laryngotracheitis

A36.3 Cutaneous diphtheria

Excludes2: erythrasma (L08.1)

A36.8 Other diphtheria

A36.81 Diphtheritic cardiomyopathy

Diphtheritic myocarditis

A36.82 Diphtheritic radiculomyelitis

A36.83 Diphtheritic polyneuritis

A36.84 Diphtheritic tubulo-interstitial nephropathy

A36.85 Diphtheritic cystitis

A36.86 Diphtheritic conjunctivitis

A36.89 Other diphtheritic complications

Diphtheritic peritonitis

A36.9 Diphtheria, unspecified

A37 Whooping cough

A37.0 Whooping cough due to Bordetella pertussis

A37.00 Whooping cough due to Bordetella pertussis without pneumonia

A37.01 Whooping cough due to Bordetella pertussis with pneumonia

A37.1 Whooping cough due to Bordetella parapertussis

A37.10 Whooping cough due to Bordetella parapertussis without pneumonia

A37.11 Whooping cough due to Bordetella parapertussis with pneumonia

A37.8 Whooping cough due to other Bordetella species

A37.80 Whooping cough due to other Bordetella species without pneumonia A37.81 Whooping cough due to other Bordetella species with pneumonia

A37.9 Whooping cough, unspecified species

A37.90 Whooping cough, unspecified species without pneumonia

A37.91 Whooping cough, unspecified species with pneumonia

A38 Scarlet fever Includes: scarlatina

Excludes2: streptococcal sore throat (J02.0)

A38.0 Scarlet fever with otitis media

A38.1 Scarlet fever with myocarditis

A38.8 Scarlet fever with other complications

A38.9 Scarlet fever, uncomplicated

Scarlet fever, NOS

A39 Meningococcal infection

A39.0 Meningococcal meningitis

A39.1 Waterhouse-Friderichsen syndrome

Meningococcal hemorrhagic adrenalitis

Meningococcic adrenal syndrome

A39.2 Acute meningococcemia

A39.3 Chronic meningococcemia

A39.4 Meningococcemia, unspecified

A39.5 Meningococcal heart disease

A39.50 Meningococcal carditis, unspecified

A39.51 Meningococcal endocarditis

A39.52 Meningococcal myocarditis

A39.53 Meningococcal pericarditis

A39.8 Other meningococcal infections

A39.81 Meningococcal encephalitis

A39.82 Meningococcal retrobulbar neuritis

A39.83 Meningococcal arthritis

A39.84 Postmeningococcal arthritis

A39.89 Other meningococcal infections

Meningococcal conjunctivitis

A39.9 Meningococcal infection, unspecified

Meningococcal disease NOS