Loop 2300 HI/FL 69 | Medicare Billing: Form CMS-1450 and the 837 Institutional

Required on inpatient hospital claims.

Table 48: Loop 2300 HI/FL 69 field
Admitting Diagnosis Code	Source
CMS requires the admitting diagnosis for inpatient hospital claims subject to QIO review.	ICD-10-CM diagnosis code

Use ICD-10-CM to code diagnostic information on claims. Multiple entities publish ICD-10-CM manuals, and the full ICD-10-CM is available to buy from the AMA Bookstore.

The Diagnosis Coding: Using the ICD-10-CM WBT course includes education on ICD-10-CM. It includes information on how to select accurate diagnosis codes from the ICD-10-CM volumes and how to use diagnosis codes correctly on Medicare claim forms.