Coding and coverage · ICD-10-CM
Instructional notes
Chapter 1
Excludes2Not included here: the patient may have both; report both when both are present.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Use additional codeAdd a second code for the full picture.
- code to identify resistance to antimicrobial drugs (Z16.-)
Includes
- diseases generally recognized as communicable or transmissible
A40
Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
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-)
Chapter 1: Certain infectious and parasitic diseases · A30-A49 Other bacterial diseases (A30-A49)
Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.
Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.