|ICD-10-CM Chapter Title||ICD-10-CM||ICD-9-CM|
|Certain Infectious and Parasitic Diseases||A00–B99||001–139|
|Diseases of the Blood and Blood-Forming Organs and Certain Disorders Involving the Immune Mechanism||D50–D89||280–289 (only includes diseases of blood and blood-forming organs)|
|Endocrine, Nutritional, and Metabolic Diseases||E00–E89||240-279 (also includes immunity disorders)|
|Mental and Behavioral Disorders||F01–F99||290–319|
|Diseases of the Nervous System||G00–G99||320–389 (Diseases of the Nervous System and Sense Organs)|
|Diseases of the Eye and Adnexa||H00–H59|
|Diseases of the Ear and Mastoid Process||H60–H95|
|Diseases of the Circulatory System||I00–I99||390–459|
|Diseases of the Respiratory System||J00–J99||460–519|
|Diseases of the Digestive System||K00–K94||520–579|
|Diseases of the Skin and Subcutaneous Tissue||L00–L99||680–709|
|Diseases of the Musculoskeletal System and Connective Tissue||M00–M99||710–739|
|Diseases of the Genitourinary System||N00–N99||580–629|
|Pregnancy, Childbirth, and the Puerperium||O00–O9a||630–677 (Complications of Pregnancy, Childbirth, and the Puerperium)|
|Certain Conditions Originating in the Perinatal Period||P00–P96||760–779|
|Congenital Malformations, Deformations, and Chromosomal Abnormalities||Q00–Q99||740–759 (Congenital Anomalies)|
|Symptoms, Signs, and Abnormal Clinical Laboratory Findings, Not Elsewhere Classified||R00–R99||780–799 (Symptoms, Signs, and Ill-Defined Conditions)|
|Injury Poisoning and Certain Other Consequences of External Causes||S00–T98||800–999 (Injury and Poisoning)|
|External Causes of Morbidity||V00–Y98||E800–E999|
|Supplementary Classification of External Causes of Injury and Poisoning Factors Influencing Health Status and Contact with Health Services||Z00–Z99||V01–V83 Supplementary Classification of Factors Influencing Health Status and Contact with Health Services|
"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.
Acute Conditions - The medical conditions characterized by sudden onset, severe change, and/or short duration.
Additional Diagnosis - The secondary diagnosis code used, if available, to provide a more complete picture of the primary diagnosis.
Bilateral - For bilateral sites, the final character of the codes in the ICD-10-CM indicates laterality. An unspecified side code is also provided should the side not be identified in the medical record. If no bilateral code is provided and the condition is bilateral, assign separate codes for both the left and right side.
Chronic Conditions - Medical conditions characterized by long duration, frequent recurrence over a long period of time, and/or slow progression over time.
Combination Codes - A single code used to classify any of the following: two diagnoses; a diagnosis with an associated secondary process (manifestation); or a diagnosis with an associated complication.
Crosswalk/mapping - A new test is determined to be similar to an existing test, multiple existing test codes, or a portion of an existing test code. The new test code is then assigned to the related existing local fee schedule amounts and resulting national limitation amount. In some instances, a test may only equate to a portion of a test, and, in those instances, payment at an appropriate percentage of the payment for the existing test is assigned.
GEMs - This reference mapping attempts to include all valid relationships between the codes in the ICD-9-CM diagnosis classification and the ICD-10-CM diagnosis classification.
Manifestation Codes - Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
Medical Necessity - Services or supplies that: are proper and needed for the diagnosis or treatment of a medical condition; are provided for the diagnosis, direct care, and treatment of a medical condition; meet the standards of good medical practice in the local area; and are not mainly for the convenience of the patient or doctor.
Morbidity - Term refers to the disease rate or number of cases of a particular disease in a given age range, gender, occupation, or other relevant population based grouping.
Mortality -Term refers to the death rate reflected by the population in a given region, age range, or other relevant statistical grouping
Principle Diagnosis - First-listed/primary diagnosis code. The code sequenced first on a medical record defines the primary reason for the encounter as determined at the end of the encounter.
Signs/Symptoms - Codes that describe symptoms and signs, as opposed to diagnoses, are acceptable for reporting purposes when a related definitive diagnosis has not been established (confirmed) by the provider.
Sequelae - A late effect is the residual effect (condition produced) after the acute phase of an illness or injury has terminated. There is no time limit on when a late effect code can be used. The residual may be apparent early, such as in cerebral infarction, or it may occur months or years later, such as that due to a previous injury.