ICD-10-CM 2027
ICD-10 code for surgery prophylactic
From the official ICD-10-CM alphabetic index entry “Prophylactic › surgery”. Page updated September 29, 2026.
About coding surgery prophylactic
The ICD-10-CM code for surgery prophylactic is Z40.9 (Encounter for prophylactic surgery, unspecified). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on Z40.9.
Within Z40, choose Z40.9 (unspecified) only when documentation doesn't support a more specific option: for risk factors related to malignant neoplasms (Z40.0) and other prophylactic surgery (Z40.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 951 (Other Factors Influencing Health Status, relative weight 0.5577), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific surgery prophylactic codes (official index)
- for risk factors related to malignant neoplasm
- specified NEC Z40.89 — Encounter for other prophylactic surgery
Common questions about surgery prophylactic ICD-10 codes
What is the ICD-10 code for surgery prophylactic?
- Z40.9 — Encounter for prophylactic surgery, unspecified. More specific codes apply when the documentation supports them: Z40.89.
Is Z40.9 billable?
- Yes. Z40.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z40.9 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is Z40.9 a CC or MCC?
- No. Z40.9 is neither a CC nor an MCC under MS-DRG v44.0.