A36

ICD-10Non-billable category

Diphtheria

Official ICD-10-CM descriptor (FY2026)

Diphtheria

A36 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.

More specific codes under A36

A36.0Pharyngeal diphtheria
A36.1Nasopharyngeal diphtheria
A36.2Laryngeal diphtheria
A36.3Cutaneous diphtheria
A36.8Other diphtheriacategory
A36.9Diphtheria, unspecified

Where this code sits

Chapter: 1. Certain infectious and parasitic diseases (A00-B99)
Block: Other bacterial diseases (A30-A49)

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.