Chapter 1: Certain infectious and parasitic diseases (A00–B99)

273 diagnoses listed as covered by Medicare billing and coding articles for HCPCS Level II codes. All chapters.

A00: Cholera

• A00.0 — Cholera due to Vibrio cholerae 01, biovar cholerae
• A00.1 — Cholera due to Vibrio cholerae 01, biovar eltor
• A00.9 — Cholera, unspecified

A01: Typhoid and paratyphoid fevers

• A01.00 — Typhoid fever, unspecified
• A01.01 — Typhoid meningitis
• A01.02 — Typhoid fever with heart involvement
• A01.03 — Typhoid pneumonia
• A01.04 — Typhoid arthritis
• A01.05 — Typhoid osteomyelitis
• A01.09 — Typhoid fever with other complications
• A01.1 — Paratyphoid fever A
• A01.2 — Paratyphoid fever B
• A01.3 — Paratyphoid fever C

A02: Other salmonella infections

• A02.0 — Salmonella enteritis
• A02.1 — Salmonella sepsis
• A02.23 — Salmonella arthritis
• A02.8 — Other specified salmonella infections

A03: Shigellosis

• A03.0 — Shigellosis due to Shigella dysenteriae
• A03.1 — Shigellosis due to Shigella flexneri
• A03.2 — Shigellosis due to Shigella boydii
• A03.3 — Shigellosis due to Shigella sonnei
• A03.8 — Other shigellosis

A04: Other bacterial intestinal infections

• A04.0 — Enteropathogenic Escherichia coli infection
• A04.1 — Enterotoxigenic Escherichia coli infection
• A04.2 — Enteroinvasive Escherichia coli infection
• A04.3 — Enterohemorrhagic Escherichia coli infection
• A04.5 — Campylobacter enteritis
• A04.6 — Enteritis due to Yersinia enterocolitica
• A04.71 — Enterocolitis due to Clostridium difficile, recurrent
• A04.72 — Enterocolitis due to Clostridium difficile, not specified as recurrent
• A04.8 — Other specified bacterial intestinal infections
• A04.9 — Bacterial intestinal infection, unspecified

A05: Other bacterial foodborne intoxications, not elsewhere classified

• A05.0 — Foodborne staphylococcal intoxication
• A05.1 — Botulism food poisoning
• A05.2 — Foodborne Clostridium perfringens [Clostridium welchii] intoxication
• A05.3 — Foodborne Vibrio parahaemolyticus intoxication
• A05.4 — Foodborne Bacillus cereus intoxication
• A05.5 — Foodborne Vibrio vulnificus intoxication

A06: Amebiasis

• A06.0 — Acute amebic dysentery
• A06.1 — Chronic intestinal amebiasis
• A06.2 — Amebic nondysenteric colitis

A07: Other protozoal intestinal diseases

• A07.1 — Giardiasis [lambliasis]
• A07.2 — Cryptosporidiosis
• A07.4 — Cyclosporiasis

A08: Viral and other specified intestinal infections

• A08.0 — Rotaviral enteritis
• A08.11 — Acute gastroenteropathy due to Norwalk agent
• A08.19 — Acute gastroenteropathy due to other small round viruses
• A08.2 — Adenoviral enteritis
• A08.31 — Calicivirus enteritis
• A08.32 — Astrovirus enteritis
• A08.39 — Other viral enteritis
• A08.8 — Other specified intestinal infections

A09: Infectious gastroenteritis and colitis, unspecified

• A09 — Infectious gastroenteritis and colitis, unspecified

A15: Respiratory tuberculosis

• A15.0 — Tuberculosis of lung

A18: Tuberculosis of other organs

• A18.01 — Tuberculosis of spine
• A18.84 — Tuberculosis of heart

A22: Anthrax

• A22.1 — Pulmonary anthrax

A30: Leprosy [Hansen's disease]

• A30.0 — Indeterminate leprosy
• A30.1 — Tuberculoid leprosy
• A30.2 — Borderline tuberculoid leprosy
• A30.3 — Borderline leprosy
• A30.4 — Borderline lepromatous leprosy
• A30.5 — Lepromatous leprosy
• A30.8 — Other forms of leprosy
• A30.9 — Leprosy, unspecified

A32: Listeriosis

• A32.11 — Listerial meningitis
• A32.12 — Listerial meningoencephalitis
• A32.7 — Listerial sepsis

A37: Whooping cough

• A37.00 — Whooping cough due to Bordetella pertussis without pneumonia
• A37.01 — Whooping cough due to Bordetella pertussis with pneumonia
• A37.10 — Whooping cough due to Bordetella parapertussis without pneumonia
• A37.11 — Whooping cough due to Bordetella parapertussis with pneumonia
• A37.80 — Whooping cough due to other Bordetella species without pneumonia
• A37.81 — Whooping cough due to other Bordetella species with pneumonia
• A37.90 — Whooping cough, unspecified species without pneumonia
• A37.91 — Whooping cough, unspecified species with pneumonia

A39: Meningococcal infection

• A39.0 — Meningococcal meningitis
• A39.81 — Meningococcal encephalitis
• A39.9 — Meningococcal infection, unspecified

A40: Streptococcal sepsis

• A40.0 — Sepsis due to streptococcus, group A
• A40.1 — Sepsis due to streptococcus, group B
• A40.3 — Sepsis due to Streptococcus pneumoniae
• A40.8 — Other streptococcal sepsis
• A40.9 — Streptococcal sepsis, unspecified

A41: Other sepsis

• A41.01 — Sepsis due to Methicillin susceptible Staphylococcus aureus
• A41.02 — Sepsis due to Methicillin resistant Staphylococcus aureus
• A41.1 — Sepsis due to other specified staphylococcus
• A41.2 — Sepsis due to unspecified staphylococcus
• A41.3 — Sepsis due to Hemophilus influenzae
• A41.4 — Sepsis due to anaerobes
• A41.50 — Gram-negative sepsis, unspecified
• A41.51 — Sepsis due to Escherichia coli [E. coli]
• A41.52 — Sepsis due to Pseudomonas
• A41.53 — Sepsis due to Serratia
• A41.54 — Sepsis due to Acinetobacter baumannii
• A41.59 — Other Gram-negative sepsis
• A41.81 — Sepsis due to Enterococcus
• A41.89 — Other specified sepsis
• A41.9 — Sepsis, unspecified organism

A42: Actinomycosis

• A42.7 — Actinomycotic sepsis

A48: Other bacterial diseases, not elsewhere classified

• A48.1 — Legionnaires' disease
• A48.2 — Nonpneumonic Legionnaires' disease [Pontiac fever]

A50: Congenital syphilis

• A50.41 — Late congenital syphilitic meningitis
• A50.42 — Late congenital syphilitic encephalitis
• A50.43 — Late congenital syphilitic polyneuropathy
• A50.45 — Juvenile general paresis

A51: Early syphilis

• A51.0 — Primary genital syphilis
• A51.1 — Primary anal syphilis
• A51.31 — Condyloma latum

A52: Late syphilis

• A52.01 — Syphilitic aneurysm of aorta
• A52.02 — Syphilitic aortitis
• A52.03 — Syphilitic endocarditis
• A52.06 — Other syphilitic heart involvement
• A52.10 — Symptomatic neurosyphilis, unspecified
• A52.11 — Tabes dorsalis
• A52.13 — Late syphilitic meningitis
• A52.14 — Late syphilitic encephalitis
• A52.15 — Late syphilitic neuropathy
• A52.16 — Charcot's arthropathy (tabetic)
• A52.17 — General paresis
• A52.19 — Other symptomatic neurosyphilis
• A52.2 — Asymptomatic neurosyphilis
• A52.3 — Neurosyphilis, unspecified
• A52.76 — Other genitourinary symptomatic late syphilis

A54: Gonococcal infection

• A54.00 — Gonococcal infection of lower genitourinary tract, unspecified
• A54.01 — Gonococcal cystitis and urethritis, unspecified
• A54.02 — Gonococcal vulvovaginitis, unspecified
• A54.03 — Gonococcal cervicitis, unspecified
• A54.09 — Other gonococcal infection of lower genitourinary tract
• A54.1 — Gonococcal infection of lower genitourinary tract with periurethral…
• A54.21 — Gonococcal infection of kidney and ureter
• A54.22 — Gonococcal prostatitis
• A54.23 — Gonococcal infection of other male genital organs
• A54.24 — Gonococcal female pelvic inflammatory disease
• A54.29 — Other gonococcal genitourinary infections
• A54.42 — Gonococcal arthritis
• A54.6 — Gonococcal infection of anus and rectum
• A54.81 — Gonococcal meningitis
• A54.83 — Gonococcal heart infection
• A54.86 — Gonococcal sepsis

A56: Other sexually transmitted chlamydial diseases

• A56.00 — Chlamydial infection of lower genitourinary tract, unspecified
• A56.01 — Chlamydial cystitis and urethritis
• A56.02 — Chlamydial vulvovaginitis
• A56.09 — Other chlamydial infection of lower genitourinary tract
• A56.11 — Chlamydial female pelvic inflammatory disease
• A56.19 — Other chlamydial genitourinary infection
• A56.2 — Chlamydial infection of genitourinary tract, unspecified
• A56.3 — Chlamydial infection of anus and rectum

A59: Trichomoniasis

• A59.00 — Urogenital trichomoniasis, unspecified
• A59.01 — Trichomonal vulvovaginitis
• A59.02 — Trichomonal prostatitis
• A59.03 — Trichomonal cystitis and urethritis
• A59.09 — Other urogenital trichomoniasis

A60: Anogenital herpesviral [herpes simplex] infections

• A60.00 — Herpesviral infection of urogenital system, unspecified
• A60.01 — Herpesviral infection of penis
• A60.02 — Herpesviral infection of other male genital organs
• A60.03 — Herpesviral cervicitis
• A60.04 — Herpesviral vulvovaginitis
• A60.09 — Herpesviral infection of other urogenital tract
• A60.1 — Herpesviral infection of perianal skin and rectum
• A60.9 — Anogenital herpesviral infection, unspecified

A63: Other predominantly sexually transmitted diseases, not elsewhere classified

• A63.0 — Anogenital (venereal) warts

A69: Other spirochetal infections

• A69.29 — Other conditions associated with Lyme disease

A77: Spotted fever [tick-borne rickettsioses]

• A77.40 — Ehrlichiosis, unspecified
• A77.41 — Ehrlichiosis chaffeensis [E. chaffeensis]
• A77.49 — Other ehrlichiosis

A78: Q fever

• A78 — Q fever

A79: Other rickettsioses

• A79.82 — Anaplasmosis [A. phagocytophilum]
• A79.9 — Rickettsiosis, unspecified

A80: Acute poliomyelitis

• A80.0 — Acute paralytic poliomyelitis, vaccine-associated
• A80.1 — Acute paralytic poliomyelitis, wild virus, imported
• A80.2 — Acute paralytic poliomyelitis, wild virus, indigenous
• A80.30 — Acute paralytic poliomyelitis, unspecified
• A80.39 — Other acute paralytic poliomyelitis
• A80.4 — Acute nonparalytic poliomyelitis
• A80.9 — Acute poliomyelitis, unspecified

A84: Tick-borne viral encephalitis

• A84.89 — Other tick-borne viral encephalitis
• A84.9 — Tick-borne viral encephalitis, unspecified

A85: Other viral encephalitis, not elsewhere classified

• A85.0 — Enteroviral encephalitis
• A85.1 — Adenoviral encephalitis
• A85.2 — Arthropod-borne viral encephalitis, unspecified
• A85.8 — Other specified viral encephalitis

A86: Unspecified viral encephalitis

• A86 — Unspecified viral encephalitis

A87: Viral meningitis

• A87.0 — Enteroviral meningitis
• A87.8 — Other viral meningitis
• A87.9 — Viral meningitis, unspecified

A93: Other arthropod-borne viral fevers, not elsewhere classified

• A93.8 — Other specified arthropod-borne viral fevers

A94: Unspecified arthropod-borne viral fever

• A94 — Unspecified arthropod-borne viral fever

B00: Herpesviral [herpes simplex] infections

• B00.0 — Eczema herpeticum
• B00.1 — Herpesviral vesicular dermatitis
• B00.2 — Herpesviral gingivostomatitis and pharyngotonsillitis
• B00.3 — Herpesviral meningitis
• B00.4 — Herpesviral encephalitis
• B00.59 — Other herpesviral disease of eye

B01: Varicella [chickenpox]

• B01.0 — Varicella meningitis
• B01.11 — Varicella encephalitis and encephalomyelitis
• B01.81 — Varicella keratitis
• B01.9 — Varicella without complication

B02: Zoster [herpes zoster]

• B02.0 — Zoster encephalitis
• B02.1 — Zoster meningitis
• B02.23 — Postherpetic polyneuropathy
• B02.29 — Other postherpetic nervous system involvement
• B02.30 — Zoster ocular disease, unspecified
• B02.31 — Zoster conjunctivitis
• B02.32 — Zoster iridocyclitis
• B02.33 — Zoster keratitis
• B02.34 — Zoster scleritis
• B02.39 — Other herpes zoster eye disease
• B02.7 — Disseminated zoster
• B02.8 — Zoster with other complications

B10: Other human herpesviruses

• B10.01 — Human herpesvirus 6 encephalitis

B17: Other acute viral hepatitis

• B17.10 — Acute hepatitis C without hepatic coma
• B17.11 — Acute hepatitis C with hepatic coma

B18: Chronic viral hepatitis

• B18.2 — Chronic viral hepatitis C

B19: Unspecified viral hepatitis

• B19.20 — Unspecified viral hepatitis C without hepatic coma
• B19.21 — Unspecified viral hepatitis C with hepatic coma

B20: Human immunodeficiency virus [HIV] disease

• B20 — Human immunodeficiency virus [HIV] disease

B25: Cytomegaloviral disease

• B25.0 — Cytomegaloviral pneumonitis
• B25.1 — Cytomegaloviral hepatitis
• B25.2 — Cytomegaloviral pancreatitis
• B25.8 — Other cytomegaloviral diseases
• B25.9 — Cytomegaloviral disease, unspecified

B27: Infectious mononucleosis

• B27.02 — Gammaherpesviral mononucleosis with meningitis
• B27.12 — Cytomegaloviral mononucleosis with meningitis
• B27.82 — Other infectious mononucleosis with meningitis

B33: Other viral diseases, not elsewhere classified

• B33.20 — Viral carditis, unspecified
• B33.21 — Viral endocarditis
• B33.22 — Viral myocarditis
• B33.23 — Viral pericarditis
• B33.24 — Viral cardiomyopathy

B35: Dermatophytosis

• B35.1 — Tinea unguium

B37: Candidiasis

• B37.31 — Acute candidiasis of vulva and vagina
• B37.32 — Chronic candidiasis of vulva and vagina
• B37.41 — Candidal cystitis and urethritis
• B37.42 — Candidal balanitis
• B37.49 — Other urogenital candidiasis
• B37.5 — Candidal meningitis
• B37.6 — Candidal endocarditis
• B37.7 — Candidal sepsis
• B37.89 — Other sites of candidiasis

B39: Histoplasmosis

• B39.0 — Acute pulmonary histoplasmosis capsulati
• B39.1 — Chronic pulmonary histoplasmosis capsulati
• B39.4 — Histoplasmosis capsulati, unspecified
• B39.5 — Histoplasmosis duboisii

B44: Aspergillosis

• B44.0 — Invasive pulmonary aspergillosis
• B44.1 — Other pulmonary aspergillosis
• B44.2 — Tonsillar aspergillosis
• B44.7 — Disseminated aspergillosis
• B44.81 — Allergic bronchopulmonary aspergillosis
• B44.89 — Other forms of aspergillosis

B45: Cryptococcosis

• B45.0 — Pulmonary cryptococcosis
• B45.1 — Cerebral cryptococcosis
• B45.3 — Osseous cryptococcosis
• B45.7 — Disseminated cryptococcosis
• B45.8 — Other forms of cryptococcosis

B48: Other mycoses, not elsewhere classified

• B48.4 — Penicillosis

B57: Chagas' disease

• B57.0 — Acute Chagas' disease with heart involvement
• B57.2 — Chagas' disease (chronic) with heart involvement

B58: Toxoplasmosis

• B58.81 — Toxoplasma myocarditis

B59: Pneumocystosis

• B59 — Pneumocystosis

B60: Other protozoal diseases, not elsewhere classified

• B60.00 — Babesiosis, unspecified
• B60.01 — Babesiosis due to Babesia microti
• B60.02 — Babesiosis due to Babesia duncani
• B60.03 — Babesiosis due to Babesia divergens
• B60.09 — Other babesiosis
• B60.2 — Naegleriasis

B77: Ascariasis

• B77.81 — Ascariasis pneumonia

B91: Sequelae of poliomyelitis

• B91 — Sequelae of poliomyelitis

B96: Other bacterial agents as the cause of diseases classified elsewhere

• B96.83 — Acinetobacter baumannii as the cause of diseases classified elsewhere

B97: Viral agents as the cause of diseases classified elsewhere

• B97.21 — SARS-associated coronavirus as the cause of diseases classified…
• B97.29 — Other coronavirus as the cause of diseases classified elsewhere
• B97.35 — Human immunodeficiency virus, type 2 [HIV 2] as the cause of…

B99: Other and unspecified infectious diseases

• B99.9 — Unspecified infectious disease