ICD-10-CM 2027 diagnosis code

A36Diphtheria

Not billable — use a more specific code

A36 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About A36

A36 is the ICD-10-CM diagnosis code for diphtheria. It belongs to block A30-A49 (other bacterial diseases) and chapter 1 (certain infectious and parasitic diseases). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: A36.0 (diphtheria), A36.1 (diphtheria), A36.2 (diphtheria), A36.3 (diphtheria), A36.8 (diphtheria) and A36.9 (unspecified).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under A36

Notes that apply from higher levels

Instructions written at a parent level also apply to A36.

Broader instructions also apply from Chapter 1: Certain infectious and parasitic diseases.

Code history

2016
2017
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2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about A36

Is A36 billable?: No. A36 is a header code. Report one of its more specific subcodes instead.