ICD-9-CM vs. ICD-10-CM Comparison

Chapter Differences

ICD-10-CM Chapter TitleICD-10-CMICD-9-CM
Certain Infectious and Parasitic DiseasesA00–B99001–139
Diseases of the Blood and Blood-Forming Organs and Certain Disorders Involving the Immune Mechanism D50–D89280–289 (only includes diseases of blood and blood-forming organs)
Endocrine, Nutritional, and Metabolic DiseasesE00–E89240-279 (also includes immunity disorders)
Mental and Behavioral DisordersF01–F99290–319
Diseases of the Nervous SystemG00–G99320–389 (Diseases of the Nervous System and Sense Organs)
Diseases of the Eye and AdnexaH00–H59
Diseases of the Ear and Mastoid ProcessH60–H95
Diseases of the Circulatory SystemI00–I99390–459
Diseases of the Respiratory SystemJ00–J99460–519
Diseases of the Digestive SystemK00–K94520–579
Diseases of the Skin and Subcutaneous TissueL00–L99680–709
Diseases of the Musculoskeletal System and Connective Tissue M00–M99710–739
Diseases of the Genitourinary SystemN00–N99580–629
Pregnancy, Childbirth, and the PuerperiumO00–O9a630–677 (Complications of Pregnancy, Childbirth, and the Puerperium)
Certain Conditions Originating in the Perinatal PeriodP00–P96760–779
Congenital Malformations, Deformations, and Chromosomal Abnormalities Q00–Q99740–759 (Congenital Anomalies)
Symptoms, Signs, and Abnormal Clinical Laboratory Findings, Not Elsewhere ClassifiedR00–R99780–799 (Symptoms, Signs, and Ill-Defined Conditions)
Injury Poisoning and Certain Other Consequences of External Causes S00–T98800–999 (Injury and Poisoning)
External Causes of MorbidityV00–Y98E800–E999
Supplementary Classification of External Causes of Injury and Poisoning Factors Influencing Health Status and Contact with Health ServicesZ00–Z99V01–V83 Supplementary Classification of Factors Influencing Health Status and Contact with Health Services

Glossary of ICD-10 Terms

Code Groupings and Codes

Code Description Terms

Code Description Punctuation

Excludes vs. Excludes1 and Excludes2

"Excludes" as used in ICD-9-CM indicates that the code should not be used, because another code may be more appropriate. "Excludes" notes usually include suggestions of more appropriate codes or code ranges.

ICD-10-CM introduces two types of excludes: "Excludes1" and "Excludes2".

Codes/conditions listed in the "Excludes1" notes should not be used because the two conditions do not occur together.

Codes/conditions listed in the "Excludes2" notes indicate that the conditions being excluded are not considered part of the subject condition, but that another code should also be assigned.

Codes may have both, either or neither Excludes1 and Excludes2 notes.

Other ICD-10 Terms

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