What data set is used for inpatient coding, specifically ICD-10 CM primary diagnosis?

The UHDDS, or Uniform Hospital Discharge Data Set, is the correct choice for inpatient coding, particularly for ICD-10-CM primary diagnosis. This data set is designed specifically for the collection of uniform data that supports the requirements of quality assessments, healthcare services research, and reimbursement, among other purposes.

UHDDS establishes a standardized collection of data elements that healthcare facilities must report for inpatient hospital stays. It includes critical information such as the principal diagnosis, secondary diagnoses, procedures, and patient demographics. This framework ensures consistency in data reporting across various healthcare facilities, which is crucial for statistical analysis and healthcare policy development.

In contrast, GEMs (General Equivalence Mappings) are used for mapping between ICD-9-CM and ICD-10-CM/PCS codes for the purpose of billing and coding during the transition period between these coding systems. HMDA (Home Mortgage Disclosure Act) pertains to mortgage lending data rather than healthcare, and PSYCKES (Psychiatric Services and Clinical Knowledge Enhancement System) focuses on behavioral health data rather than inpatient diagnostic coding. Thus, the UHDDS specifically supports the need for detailed and standardized data essential for coding and billing of inpatient services.