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ICD-10-CM 2027 diagnosis code

A40Streptococcal sepsis

Not billable — use a more specific code

A40 is a header code, so it can't be reported by itself. Choose one of the 5 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 A40

A40 is the ICD-10-CM diagnosis code for streptococcal sepsis. 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 5 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: A40.0 (A), A40.1 (B), A40.3 (pneumoniae), A40.8 (sepsis) and A40.9 (unspecified).

Don't report A40 together with the conditions in its Excludes1 note: neonatal (P36.0-P36.1), puerperal sepsis (O85) and sepsis due to Streptococcus, group D (A41.81).

Code first: , if applicable, postprocedural sepsis (T81.44-), sepsis due to central venous catheter (T80.211-), streptococcal sepsis during labor (O75.3), streptococcal sepsis following abortion or ectopic or molar pregnancy (O03.37, O03.87, O04.87, O07.37, O08.82) and 2 more.

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 A40

Coding notes

Excludes1Not coded here — never report together with this code
Code firstSequence the underlying condition first
  • , if applicable, postprocedural sepsis (T81.44-)
  • sepsis due to central venous catheter (T80.211-)
  • streptococcal sepsis during labor (O75.3)
  • streptococcal sepsis following abortion or ectopic or molar pregnancy (O03.37, O03.87, O04.87, O07.37, O08.82)
  • streptococcal sepsis following immunization (T88.0-)
  • streptococcal sepsis following infusion, transfusion or therapeutic injection (T80.22-, T80.29-)

Notes that apply from higher levels

Instructions written at a parent level also apply to A40.

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

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to A40.

Codes whose notes reference A40

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about A40

Is A40 billable?

No. A40 is a header code. Report one of its more specific subcodes instead.