Z40.9 Encounter for prophylactic surgery, unspecified

Billable ICD-10-CM code, FY2026.

Applies from Z40 Encounter for prophylactic surgery

Excludes1 (never code together)

• organ donations (Z52.-)
• therapeutic organ removal-code to condition

MS-DRG index

Defines the logic of DRG(s) 951 in MDC 23.

Approximate ICD-9-CM (GEMs)

• V50.8 Other elective surgery for purposes other than remedying health states (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Code annotations containing back-references to Z40.9

Back-references to Z40

• Type 1 Excludes: Z29 Encounter for other prophylactic measures ("prophylactic surgery (Z40.-)")

Diagnosis Index entries for Z40.9

• Prophylactic › surgery

Nearby codes

• Z40.09 Encounter for prophylactic removal of other organ
• Z40.8 Encounter for other prophylactic surgery
• Z40.81 Encounter for prophylactic surgery for removal of ovary(s) for persons without known genetic/familial risk factors
• Z40.82 Encounter for prophylactic surgery for removal of fallopian tube(s) for persons without known genetic/familial risk factors
• Z40.89 Encounter for other prophylactic surgery
• Z40.9 Encounter for prophylactic surgery, unspecified (this code)