ICD-10-CM Excludes1 Notes · Chapter 1 · FY 2027 A00-B99

Excludes1 Notes in Chapter 1: Certain infectious and parasitic diseases ICD-10-CM

An Excludes1 note means "NOT CODED HERE": the excluded code should never be reported together with the code above the note. In Chapter 1 (A00-B99), notes printed in the chapter name other codes 166 times, and Excludes1 Notes anywhere in the Tabular List name the chapter’s codes 522 times, covering 324 distinct codes, categories and ranges. Switch views to read the list either way.

✓ From the official FY 2027 ICD-10-CM Tabular ListDefinitions follow the Official Guidelines, Section I.A
166
References in Its Notes
522
References to Its Codes
324
Chapter Codes Named
A00-B99
Chapter 1
Chapter 1

Excludes1 Notes by the code that carries the note

85 of 85 shown
  • A04 Other bacterial intestinal infections applies to 11 codes
    • bacterial foodborne intoxications, NEC (A05.-)
    • tuberculous enteritis (A18.32)
  • A04.6 Enteritis due to Yersinia enterocolitica
    • extraintestinal yersiniosis (A28.2)
  • A05 Other bacterial foodborne intoxications, not elsewhere classified applies to 8 codes
    • Clostridium difficile foodborne intoxication and infection (A04.7-)
    • Escherichia coli infection (A04.0-A04.4)
    • listeriosis (A32.-)
    • salmonella foodborne intoxication and infection (A02.-)
    • toxic effect of noxious foodstuffs (T61-T62)
  • A05.1 Botulism food poisoning
  • A06 Amebiasis applies to 12 codes
    • other protozoal intestinal diseases (A07.-)
  • A08 Viral and other specified intestinal infections applies to 9 codes
  • A09 Infectious gastroenteritis and colitis, unspecified
    • colitis NOS (K52.9)
    • diarrhea NOS (R19.7)
    • enteritis NOS (K52.9)
    • gastroenteritis NOS (K52.9)
    • noninfective gastroenteritis and colitis, unspecified (K52.9)
  • Block note Block A15-A19 Tuberculosis applies to 51 codes
    • congenital tuberculosis (P37.0)
    • nonspecific reaction to test for tuberculosis without active tuberculosis (R76.1-)
    • pneumoconiosis associated with tuberculosis, any type in A15 (J65)
    • positive PPD (R76.11)
    • positive tuberculin skin test without active tuberculosis (R76.11)
    • sequelae of tuberculosis (B90.-)
    • silicotuberculosis (J65)
  • A15.4 Tuberculosis of intrathoracic lymph nodes
    • tuberculosis specified as primary (A15.7)
  • A15.6 Tuberculous pleurisy
    • primary respiratory tuberculosis (A15.7)
  • A17.0 Tuberculous meningitis
    • tuberculous meningoencephalitis (A17.82)
  • A18.83 Tuberculosis of digestive tract organs, not elsewhere classified
    • tuberculosis of intestine (A18.32)
  • A28.2 Extraintestinal yersiniosis
    • enteritis due to Yersinia enterocolitica (A04.6)
    • plague (A20.-)
  • A30 Leprosy [Hansen's disease] applies to 8 codes
    • sequelae of leprosy (B92)
  • A32 Listeriosis applies to 8 codes
    • neonatal (disseminated) listeriosis (P37.2)
  • A35 Other tetanus
    • obstetrical tetanus (A34)
    • tetanus neonatorum (A33)
  • A40 Streptococcal sepsis applies to 5 codes
  • A41 Other sepsis applies to 15 codes
  • A41.4 Sepsis due to anaerobes
  • A42 Actinomycosis applies to 8 codes
  • A46 Erysipelas
    • postpartum or puerperal erysipelas (O86.89)
  • A48 Other bacterial diseases, not elsewhere classified applies to 8 codes
  • A48.3 Toxic shock syndrome
  • A48.5 Other specified botulism applies to 2 codes
    • food poisoning due to toxins of Clostridium botulinum (A05.1)
  • A49 Bacterial infection of unspecified site applies to 7 codes
    • bacterial agents as the cause of diseases classified elsewhere (B95-B96)
    • meningococcal infection NOS (A39.9)
    • rickettsial infection NOS (A79.9)
    • spirochetal infection NOS (A69.9)
  • A49.9 Bacterial infection, unspecified
  • Block note Block A50-A64 Infections with a predominantly sexual mode of transmission applies to 142 codes
    • nonspecific and nongonococcal urethritis (N34.1)
    • Reiter's disease (M02.3-)
  • A50.3 Late congenital syphilitic oculopathy applies to 4 codes
  • A50.4 Late congenital neurosyphilis [juvenile neurosyphilis] applies to 7 codes
  • A51.39 Other secondary syphilis of skin
    • late syphilitic leukoderma (A52.79)
  • A52.79 Other symptomatic late syphilis
    • syphilitic leukoderma (secondary) (A51.39)
  • A53.9 Syphilis, unspecified
    • syphilis NOS under two years of age (A50.2)
  • A54.0 Gonococcal infection of lower genitourinary tract without periurethral or accessory gland abscess applies to 5 codes
    • gonococcal infection with genitourinary gland abscess (A54.1)
    • gonococcal infection with periurethral abscess (A54.1)
  • A54.24 Gonococcal female pelvic inflammatory disease
    • gonococcal peritonitis (A54.85)
  • A54.85 Gonococcal peritonitis
    • gonococcal pelviperitonitis (A54.24)
  • A56 Other sexually transmitted chlamydial diseases applies to 10 codes
    • neonatal chlamydial conjunctivitis (P39.1)
    • neonatal chlamydial pneumonia (P23.1)
  • Block note Block A70-A74 Other diseases caused by chlamydiae applies to 8 codes
    • sexually transmitted chlamydial diseases (A55-A56)
  • A71 Trachoma applies to 3 codes
    • sequelae of trachoma (B94.0)
  • A74 Other diseases caused by chlamydiae applies to 4 codes
    • neonatal chlamydial conjunctivitis (P39.1)
    • neonatal chlamydial pneumonia (P23.1)
    • Reiter's disease (M02.3-)
    • sexually transmitted chlamydial diseases (A55-A56)
  • A75 Typhus fever applies to 5 codes
    • rickettsiosis due to Ehrlichia sennetsu (A79.81)
  • A77.4 Ehrlichiosis applies to 3 codes
    • anaplasmosis [A. phagocytophilum] (A79.82)
    • rickettsiosis due to Ehrlichia sennetsu (A79.81)
  • Block note Block A80-A89 Viral and prion infections of the central nervous system applies to 48 codes
    • postpolio syndrome (G14)
    • sequelae of poliomyelitis (B91)
    • sequelae of viral encephalitis (B94.1)
  • A80 Acute poliomyelitis applies to 7 codes
    • acute flaccid myelitis (G04.82)
  • A85 Other viral encephalitis, not elsewhere classified applies to 4 codes
    • encephalitis due to cytomegalovirus (B25.8)
    • encephalitis due to herpesvirus NEC (B10.0-)
    • encephalitis due to herpesvirus [herpes simplex] (B00.4)
    • encephalitis due to measles virus (B05.0)
    • encephalitis due to mumps virus (B26.2)
    • encephalitis due to poliomyelitis virus (A80.-)
    • encephalitis due to zoster (B02.0)
    • lymphocytic choriomeningitis (A87.2)
    • myalgic encephalomyelitis (G93.32)
  • A85.2 Arthropod-borne viral encephalitis, unspecified
    • West nile virus with encephalitis (A92.31)
  • A87 Viral meningitis applies to 5 codes
    • meningitis due to herpesvirus [herpes simplex] (B00.3)
    • meningitis due to herpesvirus [herpes simplex] (B00.3)
    • meningitis due to measles virus (B05.1)
    • meningitis due to mumps virus (B26.1)
    • meningitis due to poliomyelitis virus (A80.-)
    • meningitis due to zoster (B02.1)
  • A88 Other viral infections of central nervous system, not elsewhere classified applies to 3 codes
    • viral encephalitis NOS (A86)
    • viral meningitis NOS (A87.9)
  • A90 Dengue fever [classical dengue]
    • dengue hemorrhagic fever (A91)
  • A92 Other mosquito-borne viral fevers applies to 11 codes
    • Ross River disease (B33.1)
  • A92.5 Zika virus disease
    • congenital Zika virus disease (P35.4)
  • A98 Other viral hemorrhagic fevers, not elsewhere classified applies to 7 codes
    • chikungunya hemorrhagic fever (A92.0)
    • dengue hemorrhagic fever (A91)
  • A98.5 Hemorrhagic fever with renal syndrome
    • hantavirus (cardio)-pulmonary syndrome (B33.4)
  • B00 Herpesviral [herpes simplex] infections applies to 15 codes
    • congenital herpesviral infections (P35.2)
  • B00.4 Herpesviral encephalitis
    • herpesviral encephalitis due to herpesvirus 6 and 7 (B10.01, B10.09)
    • non-simplex herpesviral encephalitis (B10.0-)
  • B05 Measles applies to 8 codes
    • subacute sclerosing panencephalitis (A81.1)
  • B06 Rubella [German measles] applies to 8 codes
    • congenital rubella (P35.0)
  • B08 Other viral infections characterized by skin and mucous membrane lesions, not elsewhere classified applies to 22 codes
    • vesicular stomatitis virus disease (A93.8)
  • B08.011 Vaccinia not from vaccine
    • vaccinia (from vaccination) (generalized) (T88.1)
  • Block note Block B15-B19 Viral hepatitis applies to 23 codes
    • sequelae of viral hepatitis (B94.2)
  • B20 Human immunodeficiency virus [HIV] disease
    • asymptomatic human immunodeficiency virus [HIV] infection status (Z21)
    • exposure to HIV virus (Z20.6)
    • inconclusive serologic evidence of HIV (R75)
  • B25 Cytomegaloviral disease applies to 5 codes
    • congenital cytomegalovirus infection (P35.1)
    • cytomegaloviral mononucleosis (B27.1-)
  • B30 Viral conjunctivitis applies to 6 codes
    • herpesviral [herpes simplex] ocular disease (B00.5)
    • ocular zoster (B02.3)
  • B33.4 Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS]
    • hantavirus disease with renal manifestations (A98.5)
    • hemorrhagic fever with renal manifestations (A98.5)
  • B33.8 Other specified viral diseases
    • anogenital human papillomavirus infection (A63.0)
    • viral warts due to human papillomavirus infection (B07)
  • B34 Viral infection of unspecified site applies to 7 codes
    • anogenital human papillomavirus infection (A63.0)
    • cytomegaloviral disease NOS (B25.9)
    • herpesvirus [herpes simplex] infection NOS (B00.9)
    • retrovirus infection NOS (B33.3)
    • viral agents as the cause of diseases classified elsewhere (B97.-)
    • viral warts due to human papillomavirus infection (B07)
  • B34.2 Coronavirus infection, unspecified
    • COVID-19 (U07.1)
    • pneumonia due to SARS-associated coronavirus (J12.81)
  • B37 Candidiasis applies to 17 codes
    • neonatal candidiasis (P37.5)
  • B40 Blastomycosis applies to 8 codes
    • Brazilian blastomycosis (B41.-)
    • keloidal blastomycosis (B48.0)
  • B48.2 Allescheriasis
  • Block note Block B50-B64 Protozoal diseases applies to 57 codes
    • amebiasis (A06.-)
    • other protozoal intestinal diseases (A07.-)
  • B51 Plasmodium vivax malaria applies to 3 codes
    • plasmodium vivax with Plasmodium falciparum (B50.-)
  • B52 Plasmodium malariae malaria applies to 3 codes
    • Plasmodium falciparum (B50.-)
    • Plasmodium vivax (B51.-)
  • B53.0 Plasmodium ovale malaria
    • Plasmodium ovale with Plasmodium falciparum (B50.-)
    • Plasmodium ovale with Plasmodium malariae (B52.-)
    • Plasmodium ovale with Plasmodium vivax (B51.-)
  • B53.1 Malaria due to simian plasmodia
    • Malaria due to simian plasmodia with Plasmodium falciparum (B50.-)
    • Malaria due to simian plasmodia with Plasmodium malariae (B52.-)
    • Malaria due to simian plasmodia with Plasmodium ovale (B53.0)
    • Malaria due to simian plasmodia with Plasmodium vivax (B51.-)
  • B58 Toxoplasmosis applies to 11 codes
    • congenital toxoplasmosis (P37.1)
  • B60 Other protozoal diseases, not elsewhere classified applies to 12 codes
    • cryptosporidiosis (A07.2)
    • intestinal microsporidiosis (A07.8)
    • isosporiasis (A07.3)
  • B68 Taeniasis applies to 3 codes
  • B78 Strongyloidiasis applies to 4 codes
    • trichostrongyliasis (B81.2)
  • B81 Other intestinal helminthiases, not elsewhere classified applies to 6 codes
    • Angiostrongylus cantonensis (B83.2)
    • Parastrongylus cantonensis (B83.2)
  • B83 Other helminthiases applies to 7 codes
    • capillariasis NOS (B81.1)
  • B83.9 Helminthiasis, unspecified
    • intestinal helminthiasis NOS (B82.0)
  • B91 Sequelae of poliomyelitis
    • postpolio syndrome (G14)
  • B97.21 SARS-associated coronavirus as the cause of diseases classified elsewhere
    • pneumonia due to SARS-associated coronavirus (J12.81)
  • B97.3 Retrovirus as the cause of diseases classified elsewhere applies to 7 codes
    • Human immunodeficiency virus [HIV] disease (B20)
  • B97.4 Respiratory syncytial virus as the cause of diseases classified elsewhere
    • acute bronchiolitis due to respiratory syncytial virus (RSV) (J21.0)
    • acute bronchitis due to respiratory syncytial virus (RSV) (J20.5)
    • respiratory syncytial virus (RSV) pneumonia (J12.1)

The first view lists notes printed in this chapter (a note on a category or block applies to every code beneath it). The second lists codes of this chapter named by Excludes1 Notes anywhere in the Tabular List, including notes in other chapters.

Questions About Excludes1 Notes

What does an Excludes1 note mean?

An Excludes1 note means “NOT CODED HERE!”: the excluded code should never be used at the same time as the code above the note. It is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition (Section I.A.12.a). The FY 2027 Tabular List has 5,411 of them; 5,284 name other codes, with 5,710 references to 3,528 distinct codes, categories and ranges.

Is there any exception to an Excludes1 note?

Yes: when the two conditions are unrelated to each other. The Guidelines’ example is F45.8, whose Excludes1 note names sleep related teeth grinding (G47.63). A patient with psychogenic dysmenorrhea (an inclusion term of F45.8) and teeth grinding may have both codes reported. If it is not clear whether the conditions are related, query the provider.

Related References

ICD-10-CM Official GuidelinesICD-10-CM Code LookupICD-10-CM Codes ListCode Lists by Tag

Source: FY 2027 ICD-10-CM Tabular List (CMS and NCHS) and the ICD-10-CM Official Guidelines for Coding and Reporting FY 2027, Section I.A. ICD List is not affiliated with CMS or NCHS.