Medical Data Coding Dictionary

Definitions:

ICD9
wikipedia: The International Statistical Classification of Diseases and Related Health Problems (most commonly known by the abbreviation ICD) is a medical classification that provides codes to classify diseases.

ICD9 is the most common diagnostic code currently in use in the US. Plans are underway to convert to ICD10 but progress has been postponed.

CPT
wikipedia: The Current Procedural Terminology (CPT) code set is maintained by the American Medical Association through the CPT Editorial Panel.[1] The CPT code set describes medical, surgical, and diagnostic services and is designed to communicate uniform information about medical services and procedures among physicians, coders, patients, accreditation organizations, and payers for administrative, financial, and analytical purposes.

Doctor Bills charge based on CPT code. These bills often use diagnostic codes (ie ICD9) as reason or justification codes. So the reason you required surgery (CPT code) was because you fell of a ladder and fractured your skull (ICD9 diagnostic code).

CPT code to ICD9 code can be a many to many relationship.

DRG
wikipedia: Diagnosis-related group (DRG) is a system to classify hospital cases into one of originally 467 groups. The system is also referred to as "the DRGs," and its intent was to identify the "products" that a hospital provides.

Hospital bills charge based on DRG codes. Typically they use CPT codes as a 'reason' code. In other words the reason you need to use the hospital's facilities (surgery room, bed rest/monitoring) is because of a certain surgery or surgical code (CPT).

Comorbidity
wikipedia: In medicine, comorbidity is either the presence of one or more disorders (or diseases) in addition to a primary disease or disorder, or the effect of such additional disorders or diseases.

Comorbidities show up as additional diagnostic codes on doctor bills. Common comorbities include:

diabetes, obesity, smoking, heart disease, AIDS, cancer

Code Details:

ICD9 (Diagnostic Code) Broad Grouping:
001–139: infectious and parasitic diseases
140–239: neoplasms
240–279: endocrine, nutritional and metabolic diseases, and immunity disorders
280–289: diseases of the blood and blood-forming organs
290–319: mental disorders
320–359: diseases of the nervous system
360–389: diseases of the sense organs
390–459: diseases of the circulatory system
460–519: diseases of the respiratory system
520–579: diseases of the digestive system
580–629: diseases of the genitourinary system
630–679: complications of pregnancy, childbirth, and the puerperium
680–709: diseases of the skin and subcutaneous tissue
710–739: diseases of the musculoskeletal system and connective tissue
740–759: congenital anomalies
760–779: certain conditions originating in the perinatal period
780–799: symptoms, signs, and ill-defined conditions
800–999: injury and poisoning
ICD-9 codes E and V codes: external causes of injury and supplemental classification

CPT Codes
Category I
Evaluation and Management: 99201-99499
Anaesthesia: 00100-01999; 99100-99150
Surgery: 10021-69990
Radiology: 70010-79999
Pathology & Laboratory: 80047-89398
Medicine: 90281-99199; 99500-99607

Category II
Performance Measurement (optional) (Category II codes: 0001F-7025F)
Category III
Emerging Technology (Category III codes: 0016T-0207T)

Current Topics:

http://www.edifecs.com/downloads/ICD10SummitTakeaways.pdf

Links:

http://www.hcup-us.ahrq.gov/

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