O01.9 Hydatidiform mole, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Trophoblastic disease NOS
• Vesicular mole NOS

Applies from O01 Hydatidiform mole

Excludes1 (never code together)

• chorioadenoma (destruens) (D39.2)
• malignant hydatidiform mole (D39.2)

Use additional code

• code from category O08 to identify any associated complication.

MS-DRG index

Defines the logic of DRG(s) 817-819 in MDC 14.

Approximate ICD-9-CM (GEMs)

• 630 Hydatidiform mole (approximate)

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

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Code annotations containing back-references to O01.9

Back-references to O01.9

• Type 1 Excludes: C58 Malignant neoplasm of placenta ("hydatidiform mole NOS (O01.9)")
• Type 1 Excludes: D39.2 Neoplasm of uncertain behavior of placenta ("hydatidiform mole NOS (O01.9)")

Back-references to O01

• Type 1 Excludes: D65 Disseminated intravascular coagulation [defibrination syndrome] ("abortion or ectopic or molar pregnancy (O00-O07, O08.1)")
• Type 2 Excludes: D68 Other coagulation defects ("coagulation defects complicating abortion or ectopic or molar pregnancy (O00-O07, O08.1)")
• Type 1 Excludes: G08 Intracranial and intraspinal phlebitis and thrombophlebitis ("abortion, ectopic or molar pregnancy (O00-O07, O08.7)")
• Type 2 Excludes: I26 Pulmonary embolism ("pulmonary embolism complicating abortion, ectopic or molar pregnancy (O00-O07, O08.2)")
• Code First: I47 Paroxysmal tachycardia ("abortion or ectopic or molar pregnancy (O00-O07, O08.8)")
• Code First: I49 Other cardiac arrhythmias ("abortion or ectopic or molar pregnancy (O00-O07, O08.8)")
• Code First: I50 Heart failure ("heart failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.8)")
• Code First: I74 Arterial embolism and thrombosis ("embolism and thrombosis complicating abortion or ectopic or molar pregnancy (O00-O07, O08.2)")
• Code First: I80 Phlebitis and thrombophlebitis (", if applicable: phlebitis and thrombophlebitis complicating abortion, ectopic or molar pregnancy (O00-O07, O08.7)")
• Code First: I82 Other venous embolism and thrombosis ("abortion, ectopic or molar pregnancy (O00-O07, O08.7)")
• Type 1 Excludes: K65 Peritonitis ("peritonitis with or following abortion or ectopic or molar pregnancy (O00-O07, O08.0)")
• Type 2 Excludes: K72 Hepatic failure, not elsewhere classified ("hepatic failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.8)")
• Type 1 Excludes: O02.1 Missed abortion ("missed abortion with hydatidiform mole (O01.-)")
• Type 1 Excludes: O02.8 Other specified abnormal products of conception ("abnormal products of conception with hydatidiform mole (O01.-)")
• Type 1 Excludes: O20 Hemorrhage in early pregnancy ("pregnancy with abortive outcome (O00-O08)")
• Type 1 Excludes: R34 Anuria and oliguria ("anuria and oliguria complicating abortion or ectopic or molar pregnancy (O00-O07, O08.4)")
• Type 1 Excludes: R55 Syncope and collapse ("shock complicating or following abortion or ectopic or molar pregnancy (O00-O07, O08.3)")
• Type 1 Excludes: R57 Shock, not elsewhere classified ("shock complicating or following ectopic or molar pregnancy (O00-O07, O08.3)")
• Type 1 Excludes: T79.0 Air embolism (traumatic) ("air embolism complicating abortion or ectopic or molar pregnancy (O00-O07, O08.2)")
• Type 1 Excludes: T79.1 Fat embolism (traumatic) ("abortion or ectopic or molar pregnancy (O00-O07, O08.2)")
• Type 1 Excludes: T79.4 Traumatic shock ("shock complicating abortion or ectopic or molar pregnancy (O00-O07, O08.3)")
• Type 1 Excludes: T81.1 Postprocedural shock ("shock following abortion or ectopic or molar pregnancy (O00-O07, O08.3)")
• Type 1 Excludes: T81.7 Vascular complications following a procedure, not elsewhere classified ("embolism complicating abortion or ectopic or molar pregnancy (O00-O07, O08.2)")

Diagnosis Index entries for O01.9

• Hydatidiform mole (benign) (complicating pregnancy) (delivered) (undelivered)
• Mole (pigmented) › hydatid, hydatidiform (benign) (complicating pregnancy) (delivered) (undelivered)
• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › hydatidiform mole
• Pregnancy (single) (uterine) › molar NEC › hydatidiform
• Trophoblastic disease

Nearby codes

• O01 Hydatidiform mole
• O01.0 Classical hydatidiform mole
• O01.1 Incomplete and partial hydatidiform mole
• O01.9 Hydatidiform mole, unspecified (this code)