2027 ICD-10-CM Diagnosis Code O01.0Classical hydatidiform mole
ICD-10-CM Codes›O00-O9A›O00-O08›O01
- Billable — Valid for Submission
- Not Chronic
O01.0 is a billable ICD-10-CM diagnosis code for classical hydatidiform mole. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 817 through 819, 831 through 833. The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). Coders also document this condition as complete hydatidiform mole. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Molar pregnancy and other abnormal products of conception.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for O01.0.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Complete hydatidiform mole
- Gestational trophoblastic disease
- Hydatidiform mole, benign
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to O01.0: its own notes plus those printed at O01, block O00-O08, and Chapter 15. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Complete hydatidiform mole
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- supervision of normal pregnancy (Z34.-)
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code from category O08 to identify any associated complication.
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Notes
General instructions on how these codes are used.
- CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
- Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
- Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
- 1st trimester- less than 14 weeks 0 days
- 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
- 3rd trimester- 28 weeks 0 days until delivery
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name O01.0, its category, or a range that includes it.
Excludes1 13
These codes carry an Excludes1 note naming O01.0: they are not reported together with it, unless the two conditions are unrelated.
- O02.1 Missed abortionmissed abortion with hydatidiform mole (O01.-) names O01.-, which includes this code
- O02.8 Other specified abnormal products of conceptionabnormal products of conception with hydatidiform mole (O01.-) names O01.-, which includes this code
- G08 Intracranial and intraspinal phlebitis and thrombophlebitis
- K65 Peritonitis
- Block N70-N77 Inflammatory diseases of female pelvic organs
- R34 Anuria and oliguria
- R55 Syncope and collapse
- R57 Shock, not elsewhere classified
- T79.0 Air embolism (traumatic)
- T79.1 Fat embolism (traumatic)
- T79.4 Traumatic shock
- T81.1 Postprocedural shock
- T81.7 Vascular complications following a procedure, not elsewhere classified
Excludes2 6
These codes carry an Excludes2 note naming O01.0: its condition is not part of those codes, and both may be reported when the patient has both.
- D65 Disseminated intravascular coagulation [defibrination syndrome]
- D68 Other coagulation defects
- I26 Pulmonary embolism
- K72 Hepatic failure, not elsewhere classified
- Block N17-N19 Acute kidney failure and chronic kidney disease
- Block N30-N39 Other diseases of the urinary system
Code First 6
These codes say to code first a condition named in the note, and O01.0 is one of the conditions named.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Mole (pigmented) See Also: Nevus;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Complete Hydatidiform Mole
a gestational trophoblastic disorder in which there is no embryo or normal placental tissue and the chorionic villi are hydropic.Hydatidiform Mole
trophoblastic hyperplasia associated with normal gestation, or molar pregnancy. it is characterized by the swelling of the chorionic villi and elevated human chorionic gonadotropin. hydatidiform moles or molar pregnancy may be categorized as complete or partial based on their gross morphology, histopathology, and karyotype.
Patient EducationClinical
Tumors and Pregnancy
Tumors during pregnancy are rare, but they can happen. Tumors can be either benign (not cancer) or malignant (cancer). The most common cancers in pregnancy include breast cancer, thyroid cancer, cervical cancer, lymphoma, and melanoma. Cancer itself rarely harms the fetus, and some cancer treatments are safe during pregnancy.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert O01.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About O01.0Overview
What is the ICD-10 code for classical hydatidiform mole?
The ICD-10-CM code for classical hydatidiform mole is O01.0 (sometimes written as O010). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is O01.0 (Hydatidiform mole) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report classical hydatidiform mole on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does O01.0 group to?
When classical hydatidiform mole is the principal diagnosis on an inpatient stay, it groups to MS-DRG 833, 832, 831, 819, 818, 817, with relative weights from 0.5000 to 1.7586 depending on complications. Higher weights mean higher Medicare reimbursement.
Who can O01.0 be reported for?
The Medicare Code Editor checks classical hydatidiform mole against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.
Can O01.0 be reported with D39.2?
Not as a rule. The Excludes1 note at O01, which applies to O01.0, lists "chorioadenoma (destruens) (D39.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
