ICD-10-CM
ICD-10 code for Diphtheria: A36.9
The ICD-10-CM index points "Diphtheria" to A36 (Diphtheria), a header that is not billable. When nothing more specific is documented, the billable code is A36.9, Diphtheria, unspecified.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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Index subterms
A header groups codes and is not billed. A billable code is one you can report.
- Z22.2carrier (suspected), Carrier of diphtheriaBillable
- A36.3cutaneous, Cutaneous diphtheriaBillable
- A36.0faucial, Pharyngeal diphtheriaBillable
- A36.3infection of wound, Cutaneous diphtheriaBillable
- A36.2laryngeal, Laryngeal diphtheriaBillable
- A36.81myocarditis, Diphtheritic cardiomyopathyBillable
- A36.89nasal, anterior, Other diphtheritic complicationsBillable
- A36.1nasopharyngeal, Nasopharyngeal diphtheriaBillable
- A36.89neurological complication, Other diphtheritic complicationsBillable
- A36.0pharyngeal, Pharyngeal diphtheriaBillable
- A36.89specified site NEC, Other diphtheritic complicationsBillable
- A36.0tonsillar, Pharyngeal diphtheriaBillable
More specific codes in A36
A header groups codes and is not billed. A billable code is one you can report.
- A36DiphtheriaHeader
- A36.0Pharyngeal diphtheriaBillable
- A36.1Nasopharyngeal diphtheriaBillable
- A36.2Laryngeal diphtheriaBillable
- A36.3Cutaneous diphtheriaBillable
- A36.8Other diphtheriaHeader
- A36.81Diphtheritic cardiomyopathyBillable
- A36.82Diphtheritic radiculomyelitisBillable
- A36.83Diphtheritic polyneuritisBillable
- A36.84Diphtheritic tubulo-interstitial nephropathyBillable
- A36.85Diphtheritic cystitisBillable
- A36.86Diphtheritic conjunctivitisBillable
- A36.89Other diphtheritic complicationsBillable
- A36.9Diphtheria, unspecifiedBillable
Related conditions
Related pages
- A36.9 code detailsNotes, nearby codes, CMS-HCC group
- Category A36Every code under it
- Chapter 1Certain infectious and parasitic diseases
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Diphtheria?
The ICD-10-CM index points "Diphtheria" to A36 (Diphtheria), a header that is not billable. When nothing more specific is documented, the billable code is A36.9, Diphtheria, unspecified.
Is A36.9 billable?
Yes. A36.9 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What chapter is A36.9 in?
Chapter 1. Certain infectious and parasitic diseases.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.