AHRQ Clinical Classifications Software Refined (CCSR) Diagnosis 1 Category Code

SAS Name

AHRQ Clinical Classifications Software Refined (CCSR) Diagnosis Category Code. The CCSR aggregates International Classification of Diseases, 10th Revision, Clinical Modification/Procedure Coding System (ICD-10-CM/PCS) codes into clinically meaningful categories. The CCSR for ICD-10-CM diagnoses aggregates more than 70,000 ICD-10-CM diagnosis codes into over 530 clinical categories across 21 body systems.


AHRQ maintains the list of values at the following link; scroll to the “Downloading Information for the Tool and Documentation” portion of the page: https://www.hcupus.ahrq.gov/toolssoftware/ccsr/ccs_refined.jsp

CMS used the CCSR software v2021.2 to populate this field. CCSR uses the first three characters to indicate which of the 21 body systems applies. In the TAF the CCSR was mapped to the Primary or Principal Diagnosis Code (variable called DGNS_CD_1) The 21 systems are:

Abbreviation CCSR Body Systems

INF = Certain Infectious and Parasitic Diseases

NEO = Neoplasms

BLD = Diseases of the Blood and Blood Forming Organs and Certain Disorders Involving the Immune Mechanism

END = Endocrine, Nutritional and Metabolic Diseases

MBD = Mental, Behavioral and Neurodevelopmental Disorders

NVS = Diseases of the Nervous System

EYE = Diseases of the Eye and Adnexa

EAR = Diseases of the Ear and Mastoid Process

CIR = Diseases of the Circulatory System

RSP = Diseases of the Respiratory System

DIG = Diseases of the Digestive System

SKN = Diseases of the Skin and Subcutaneous Tissue

MUS = Diseases of the Musculoskeletal System and Connective Tissue

GEN = Diseases of the Genitourinary System

PRG = Pregnancy, Childbirth, and the Puerperium

PNL = Certain Conditions Originating in the Perinatal Period

MAL = Congenital Malformations, Deformations and Chromosomal Abnormalities

SYM = Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified

INJ = Injury, Poisoning and Certain Other Consequences of External Causes

EXT = External Causes of Morbidity

FAC = Factors Influencing Health Status and Contact with Health Services

Values: Six-character alpha-numeric value; first three characters classify the body system (refer to COMMENT)

Ex - INF005 = Foodborne intoxications

Null/missing = source value is missing or unknown

Source: T-MSIS Analytic File (TAF) Claims