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ICD-10-CM 2027 diagnosis code

A40.0Sepsis due to streptococcus, group A

✓ Billable / specificMCC — major complication/comorbidity

A40.0 is a valid, billable ICD-10-CM code for sepsis due to streptococcus, group a. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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 A40.0

A40.0 is the ICD-10-CM diagnosis code for sepsis due to streptococcus, group A. It belongs to category A40 (streptococcal sepsis), block A30-A49 (other bacterial diseases) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within A40 (streptococcal sepsis), A40.0 is specifically for sepsis due to streptococcus, group A. Related codes cover sepsis due to streptococcus, group B (A40.1), sepsis due to Streptococcus pneumoniae (A40.3), other streptococcal sepsis (A40.8) and unspecified (A40.9).

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.

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 870 (Septicemia or Severe Sepsis with MV >96 Hours, relative weight 6.9408), DRG 871 (Septicemia or Severe Sepsis without MV >96 Hours with MCC, relative weight 1.932) and DRG 872 (Septicemia or Severe Sepsis without MV >96 Hours without MCC, relative weight 1.0066), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

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

Before ICD-10, this condition was coded in ICD-9-CM as 038.0 (streptococcal septicemia) and 995.91 (sepsis).

Notes that apply from higher levels

Instructions written at a parent level also apply to A40.0.

› From A40 Streptococcal sepsis
Excludes1
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)
  • streptococcal sepsis following immunization (T88.0-)
  • streptococcal sepsis following infusion, transfusion or therapeutic injection (T80.22-, T80.29-)

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 A40.0.

Codes whose notes reference A40.0

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 038.0Streptococcal septicemiaapproximate, combination
  • 995.91Sepsisapproximate, combination

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

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 A40.0

Is A40.0 billable?

Yes. A40.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can A40.0 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict A40.0 as a principal diagnosis.

Is A40.0 a CC or MCC?

A40.0 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does A40.0 group to?

A40.0 is used in the MS-DRG v44.0 logic for MS-DRG 870 (Septicemia or Severe Sepsis with MV >96 Hours), MS-DRG 871 (Septicemia or Severe Sepsis without MV >96 Hours with MCC) and MS-DRG 872 (Septicemia or Severe Sepsis without MV >96 Hours without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for A40.0?

The CMS General Equivalence Mappings map A40.0 to ICD-9-CM 038.0 and 995.91.