ICD-9-CM Diagnosis Code 631.0
Diagnosis Code: 631.0 (Raw: 6310)
Description: Inappropriate change in quantitative human chorionic gonadotropin (hCG) in early pregnancy
Classification: International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM)
Fiscal Year: 2026 Reference
CMS Section 111 Status: Valid for reporting.
Overview & Historical Usage
ICD-9-CM code 631.0 is designated for Inappropriate change in quantitative human chorionic gonadotropin (hCG) in early pregnancy. While superseded by ICD-10 for current healthcare encounters, it remains a recognized reference code for CMS Section 111 reporting, legacy claims adjudication, and historical clinical data analysis.