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Domain

Clinical

EHR, ICD-10, LOINC, SNOMED CT, patient care and clinical documentation

16,101 clinical terms

GastrointestinalGI

GI is a clinical domain classification used across EHR, claims, and referral management systems to categorize diagnoses, procedures, and specialty encounters related to the digestive tract. GI-coded claims drive specialty routing logic, utilization management edits, and service line analytics in healthcare data warehouses.

Gaugegauge

A standardized unit of measurement for needle and catheter diameter used in clinical settings. Higher gauge numbers indicate smaller diameter needles. Gauge selection is documented in nursing and clinical procedure records in EHR systems and affects medication administration and IV therapy protocols.

Genome-Wide Association StudyGWAS

GWAS is a genomic research methodology generating large-scale SNP datasets linked to disease phenotypes, stored in clinical genomics platforms and research EHR systems. Data engineers handle GWAS outputs in variant annotation pipelines, biobank integration workflows, and precision medicine data lakes supporting population health research programs.

GeriatricsGERI

Abbreviated as GERI, this medical specialty focuses on the diagnosis, treatment, and preventive care of patients typically aged 65 and older. In EHR, claims, and member enrollment systems, GERI is used as a specialty code to route referrals, classify provider types, segment populations, and support elderly-focused quality reporting programs.

Glasgow Coma ScaleGCS

Abbreviated as GCS, this standardized neurological assessment tool scores a patient's level of consciousness from 3 to 15 based on eye opening, verbal response, and motor response components. Widely documented in EHR clinical notes, ICU flowsheets, and trauma registries to guide acute care decisions and track neurological status changes over time.

Glomerular Filtration RateGFR

Abbreviated as GFR, this clinical lab measurement estimates kidney filtration capacity in milliliters per minute per 1.73 m² of body surface area, calculated from serum creatinine, age, sex, and race. Stored in EHR lab result tables and used in pharmacy systems to guide drug dosing adjustments, flag renal contraindications, and support chronic kidney disease staging.

GlucoseGLU

A primary biomarker measured in laboratory and point-of-care systems to assess blood sugar levels in patients. Stored in EHR and lab results data as discrete values used for diabetes management, ICU monitoring, medication dosing decisions, and population health analytics across clinical care settings.

Good Clinical PracticeGCP

An international quality standard governing the design, conduct, and reporting of clinical trials involving human subjects. Referenced in clinical research data systems to ensure data integrity, patient safety compliance, and regulatory submission readiness for FDA, EMA, and ICH-governed study documentation.

Good Distribution PracticesGDP

Regulatory guidelines governing the proper storage, handling, and distribution of pharmaceutical products throughout the supply chain. Referenced in pharmacy and supply chain data systems to ensure drug integrity, traceability, and compliance with FDA and WHO standards from manufacturer to point of dispensing.

Good Laboratory PracticeGLP

A regulatory framework governing the conduct, documentation, and reporting of non-clinical laboratory studies for safety assessment. Referenced in lab and clinical research data systems to ensure data traceability, study integrity, and compliance with FDA 21 CFR Part 58 and OECD regulatory standards.

Good Manufacturing PracticesGMP

Regulatory standards governing the production and quality control of pharmaceutical and medical device products. Referenced in supply chain, pharmacy, and compliance data systems to ensure product safety, batch traceability, and adherence to FDA 21 CFR and ICH Q7 manufacturing quality requirements.

GynecologyGYN

Medical specialty focused on the female reproductive system, abbreviated as GYN in EHR, claims, and provider data systems. Used to classify provider specialties, procedure codes, diagnosis codes (ICD-10), and departmental workflows in clinical and administrative healthcare data platforms.

H2 Receptor AntagonistH2RA

A class of medications that reduce gastric acid production by blocking histamine H2 receptors, abbreviated H2RA in pharmacy and PBM systems. Used in drug classification databases, formulary management, claims adjudication, and clinical decision support within EHR and pharmacy benefit platforms.

HCC flaghcc_flg

Binary indicator identifying whether a diagnosis code maps to a Hierarchical Condition Category in the CMS-HCC risk adjustment model. HCC flags are applied during claims processing to identify diagnoses that contribute to a member risk adjustment factor score. Healthcare data engineers use HCC flags in Medicare Advantage risk adjustment pipelines to calculate RAF scores and support CMS RAPS and EDPS submissions.

HMG-CoA Reductase InhibitorStatin

Drug class of cholesterol-lowering medications identified by RxNorm drug class codes in pharmacy, PBM, and EHR medication data systems. Statin prescribing and adherence metrics are used in HEDIS measure calculations, cardiovascular risk population analytics, and formulary management within claims and pharmacy data pipelines.

Hairy Cell LeukemiaHCL

A rare, slow-growing blood cancer classified under ICD-10 code C91.4, abbreviated as HCL in oncology EHR systems and claims data. Used in diagnosis classification, oncology registry data, prior authorization workflows, and specialty pharmacy benefit management for targeted therapies.

Health Information Technology for Economic and Clinical Health ActHITECH

Federal legislation enacted in 2009 that expanded HIPAA enforcement, established breach notification requirements, and incentivized EHR adoption. Governs data governance policies in EHR, HIE, and healthcare analytics platforms, impacting audit logging, breach reporting workflows, and business associate agreement requirements.

Healthcare Common Procedure Coding SystemHCPCS

A standardized coding system used to report medical procedures, supplies, products, and services not covered by CPT codes. Includes Level I codes (CPT) and Level II codes for durable medical equipment, ambulance services, and drugs. Required on Medicare and Medicaid claims for non-physician services.

Heart RateHR

A clinical vital sign representing the number of cardiac cycles per minute, recorded in EHR systems as a discrete numeric observation using LOINC code 8867-4. Heart rate values are ingested into clinical data warehouses from monitoring devices, nursing flowsheets, and ambulatory visit records for use in risk stratification and population health analytics.

HematocritHCT

A laboratory measurement representing the percentage of red blood cells in total blood volume, commonly included in Complete Blood Count (CBC) panels. In EHR and lab data systems, HCT results are stored as discrete numeric values mapped to LOINC code 20570-8 and used in clinical decision support, anemia monitoring, and chronic disease management workflows.

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