Internal Medicine Acronyms

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Internal Medicine Alphabet – C

S. No	Acronyms	Full Form	Short Explanation	Practical Example
C001	CABG	Coronary Artery Bypass Graft	Surgical procedure to restore blood flow to the heart.	CABG performed in triple vessel disease.
C002	CAD	Coronary Artery Disease	Narrowing of coronary arteries causing angina/MI.	CAD diagnosed on coronary angiography.
C003	CAH	Congenital Adrenal Hyperplasia	Genetic disorder of adrenal hormone synthesis.	Newborn screening detects CAH.
C004	CA-125	Cancer Antigen 125	Tumor marker for ovarian cancer.	Elevated CA-125 in ovarian carcinoma.
C005	CA-19-9	Cancer Antigen 19-9	Tumor marker for pancreatic cancer.	High CA-19-9 in pancreatic adenocarcinoma.
C006	Ca	Calcium	Essential mineral for bone and muscle function.	Hypocalcemia causes tetany.
C007	CAB	Community-Acquired Bacteremia	Infection acquired outside hospital.	CAB confirmed by blood culture.
C008	CACP	Congenital Arthropathy with Camptodactyly	Rare genetic joint disease.	CACP diagnosed in childhood.
C009	CAC	Coronary Artery Calcium	CT-based score predicting CAD risk.	CAC score >400 = high risk.
C010	CADASIL	Cerebral Autosomal Dominant Arteriopathy with Subcortical Infarcts and Leukoencephalopathy	Genetic stroke disorder.	CADASIL confirmed by NOTCH3 mutation.
C011	CAE	Coronary Artery Ectasia	Dilatation of coronary arteries.	CAE seen in angiogram.
C012	CAF	Coronary Artery Fistula	Abnormal connection of coronary artery.	CAF diagnosed by CT angiography.
C013	CAL	Clinical Attachment Level	Dental term for periodontal disease.	CAL measured in periodontitis.
C014	CAM	Confusion Assessment Method	Tool to diagnose delirium.	CAM used in elderly ICU patient.
C015	CAP	Community-Acquired Pneumonia	Pneumonia developed outside hospital.	CAP treated with macrolides.
C016	CARS	Compensatory Anti-Inflammatory Response Syndrome	Immunological response in sepsis.	CARS follows SIRS.
C017	CAS	Carotid Artery Stenosis	Narrowing of carotid artery.	CAS managed by endarterectomy.
C018	CAT	COPD Assessment Test	Tool to assess COPD impact.	CAT score guides therapy.
C019	CAV	Cardiac Allograft Vasculopathy	Complication of heart transplant.	CAV detected on angiography.
C020	CBC	Complete Blood Count	Routine hematology test.	CBC ordered for anemia evaluation.
C021	CBD	Common Bile Duct	Biliary duct carrying bile.	CBD stones cause obstructive jaundice.
C022	CBG	Capillary Blood Glucose	Bedside blood sugar test.	CBG used for diabetic monitoring.
C023	CBN	Central Brain Necrosis	Neurological complication.	CBN seen on MRI after stroke.
C024	CBT	Cognitive Behavioral Therapy	Psychological treatment method.	CBT effective in depression.
C025	CC	Chief Complaint	Primary reason for patient visit.	“Chest pain” noted as CC.
C026	CCB	Calcium Channel Blocker	Class of antihypertensive drugs.	Amlodipine is a CCB.
C027	CCE	Cardiac Care Evaluation	Protocol for cardiac assessment.	CCE performed in chest pain unit.
C028	CCF	Congestive Cardiac Failure	Condition with impaired pumping function.	CCF manifests as dyspnea and edema.
C029	CCG	Clinical Commissioning Group	UK healthcare body.	CCG funds local NHS services.
C030	CCHD	Critical Congenital Heart Disease	Severe heart defect in neonates.	Pulse oximetry used for CCHD screening.
C031	CCL	Chemokine Ligand	Family of cytokines in immunity.	CCL2 recruits monocytes.
C032	CCM	Critical Care Medicine	Specialty dealing with ICU care.	Patient admitted under CCM.
C033	CCN	Cardiac Care Nurse	Specialized nurse for cardiology.	CCN monitors post-MI patients.
C034	CCP	Cyclic Citrullinated Peptide	Autoantibody in rheumatoid arthritis.	Anti-CCP positive in RA.
C035	CCR	Creatinine Clearance Rate	Measure of kidney function.	CCR estimated with Cockcroft-Gault.
C036	CCS	Canadian Cardiovascular Society	Angina classification system.	CCS grade II angina.
C037	CCT	Chest Computed Tomography	Imaging modality.	CCT ordered in suspected lung tumor.
C038	CCU	Coronary Care Unit	Specialized hospital ward.	Post-MI patients admitted to CCU.
C039	CD	Crohn’s Disease	Chronic inflammatory bowel disease.	CD causes abdominal pain and diarrhea.
C040	CDB	Complete Diastolic Block	ECG conduction disorder.	CDB confirmed on ECG.
C041	CDC	Centers for Disease Control and Prevention	US federal health agency.	CDC guidelines followed for COVID-19.
C042	CDD	Chronic Diarrheal Disease	Long-standing diarrhea condition.	CDD due to IBD.
C043	CDE	Carbohydrate-Deficient Transferrin	Marker of chronic alcohol use.	CDE test ordered in alcoholism.
C044	CDH	Congenital Diaphragmatic Hernia	Birth defect of diaphragm.	CDH causes neonatal respiratory distress.
C045	CDI	Clostridioides difficile Infection	Hospital-acquired diarrhea infection.	CDI managed with vancomycin.
C046	CDK	Cyclin-Dependent Kinase	Enzyme controlling cell cycle.	CDK inhibitors used in cancer therapy.
C047	CDR	Cup-to-Disc Ratio	Ophthalmology measure in glaucoma.	High CDR indicates optic nerve damage.
C048	CDS	Clinical Decision Support	Digital tool to aid medical decisions.	CDS alerts doctor of drug interactions.
C049	CDT	Carbohydrate-Deficient Transferrin	Alcohol abuse marker.	CDT elevated in chronic alcoholism.
C050	CEA	Carcinoembryonic Antigen	Tumor marker for colorectal cancer.	Elevated CEA post-surgery suggests recurrence.
C051	CEBM	Centre for Evidence-Based Medicine	Oxford evidence-based practice group.	CEBM provides EBM tools.
C052	CECT	Contrast-Enhanced Computed Tomography	Imaging with contrast.	CECT abdomen shows liver mass.
C053	CEL	Celiac Disease	Autoimmune gluten intolerance.	CEL managed by gluten-free diet.
C054	CEM	Cardiac Event Monitor	Device for arrhythmia detection.	CEM worn by patient with palpitations.
C055	CEO	Chief Executive Officer	Administrative head of hospital.	CEO approved funding for ICU.
C056	CEP	Chronic Eosinophilic Pneumonia	Rare eosinophilic lung disease.	CEP responds to steroids.
C057	CERV	Cervical Cancer	Malignancy of cervix.	HPV infection predisposes to CERV.
C058	CES	Cauda Equina Syndrome	Spinal emergency with paralysis.	CES requires urgent MRI and surgery.
C059	CEST	Chemical Exchange Saturation Transfer	MRI technique.	CEST imaging in oncology.
C060	CF	Cystic Fibrosis	Genetic lung and pancreas disorder.	CF diagnosed by sweat chloride test.
C061	CFA	Cerebrospinal Fluid Analysis	Diagnostic test of CSF.	CFA ordered in suspected meningitis.
C062	CFH	Complement Factor H	Protein regulating complement.	CFH mutation linked to HUS.
C063	CFI	Complement Factor I	Complement system protein.	CFI deficiency predisposes to infections.
C064	CFL	Craniofacial Length	Anthropometric measurement.	CFL used in dysmorphology studies.
C065	CFM	Continuous Fetal Monitoring	Labor monitoring technique.	CFM used during delivery.
C066	CFN	Craniofacial Nerve	Refers to facial nerve complex.	CFN tested in neurological exam.
C067	CFP	Clinical Fellowship Program	Postgraduate training scheme.	Resident joined CFP in cardiology.
C068	CFR	Case Fatality Rate	Epidemiological measure of deaths.	CFR of Ebola is very high.
C069	CFS	Chronic Fatigue Syndrome	Syndrome of persistent fatigue.	CFS patient struggles with daily activities.
C070	CGA	Comprehensive Geriatric Assessment	Multidisciplinary elderly care tool.	CGA done in frail patient.
C071	CGB	Chorionic Gonadotropin, Beta	Pregnancy hormone subunit.	Serum CGB used for pregnancy test.
C072	CGI	Clinical Global Impression	Psychiatric rating scale.	CGI used in schizophrenia trials.
C073	CGM	Continuous Glucose Monitoring	Device for real-time sugar monitoring.	CGM recommended in T1DM.
C074	CH	Cluster Headache	Severe unilateral headache disorder.	CH managed with oxygen therapy.
C075	CHA2DS2-VASc	Congestive Heart Failure, Hypertension, Age ≥75, Diabetes, Stroke, Vascular Disease, Age 65–74, Sex Category	Risk score for stroke in AF.	CHA2DS2-VASc score guides anticoagulation.
C076	CHADS2	CHF, Hypertension, Age ≥75, Diabetes, Stroke	Stroke risk score in AF.	CHADS2 score used in cardiology.
C077	CHC	Combined Hormonal Contraceptive	Contraception using estrogen and progestin.	CHC prescribed to young women.
C078	CHF	Congestive Heart Failure	Heart failure with volume overload.	CHF manifests with edema and dyspnea.
C079	CHL	Cholesterol	Lipid molecule in body.	High CHL causes atherosclerosis.
C080	CHO	Carbohydrate	Macronutrient.	CHO intake counted in diabetes diet.
C081	CHR	Chronic Hemolytic Reaction	Hematologic complication.	CHR in transfusion patient.
C082	CHS	Cannabinoid Hyperemesis Syndrome	Vomiting due to cannabis use.	CHS treated with abstinence.
C083	CHX	Chlorhexidine	Antiseptic solution.	CHX used in mouthwash.
C084	CI	Cardiac Index	CO/body surface area, measure of heart function.	CI low in cardiogenic shock.
C085	CID	Chronic Infectious Disease	Long-standing infection.	CID includes TB and HIV.
C086	CIDS	Clinical Implantable Defibrillator Study	Landmark trial in cardiology.	CIDS supported ICD use.
C087	CIG	Cigarette	Tobacco product harmful to health.	CIG smoking linked to lung cancer.
C088	CIMT	Carotid Intima-Media Thickness	Ultrasound marker of atherosclerosis.	CIMT >0.9 mm = abnormal.
C089	CIN	Cervical Intraepithelial Neoplasia	Precancerous lesion of cervix.	CIN detected on Pap smear.
C090	CIP	Community Infection Protocol	Hospital infection policy.	CIP followed during outbreak.
C091	CIPD	Chronic Inflammatory Demyelinating Polyneuropathy	Neurological autoimmune disorder.	CIPD treated with IVIG.
C092	CIRCI	Critical Illness-Related Corticosteroid Insufficiency	Adrenal insufficiency in ICU.	CIRCI suspected in refractory shock.
C093	CIS	Carcinoma In Situ	Early-stage cancer without invasion.	CIS found on biopsy.
C094	CJD	Creutzfeldt-Jakob Disease	Prion brain disease.	CJD causes rapidly progressive dementia.
C095	CK	Creatine Kinase	Enzyme elevated in muscle damage.	CK high in rhabdomyolysis.
C096	CKD	Chronic Kidney Disease	Long-term kidney dysfunction.	CKD staged by eGFR.
C097	CKS	Chronic Kidney Stone	Recurrent nephrolithiasis.	CKS causes flank pain.
C098	CLL	Chronic Lymphocytic Leukemia	Common adult leukemia.	CLL diagnosed on flow cytometry.
C099	CLABSI	Central Line-Associated Bloodstream Infection	Serious ICU infection.	CLABSI prevented by sterile technique.
C100	CLD	Chronic Liver Disease	Long-term hepatic dysfunction.	CLD causes cirrhosis.

S. No	Acronyms	Full Form	Short Explanation	Practical Example
C101	CLE	Cutaneous Lupus Erythematosus	Skin-limited form of lupus.	CLE presents with malar rash.
C102	CLIA	Clinical Laboratory Improvement Amendments	US standards for lab testing.	CLIA certification required for labs.
C103	CLIF	Chronic Liver Failure	Progressive hepatic dysfunction.	CLIF patients may need transplant.
C104	CLIP	Cancer of the Liver Italian Program	Prognostic score for HCC.	CLIP score predicts HCC survival.
C105	CLN	Clinical	Abbreviation often used in notes.	“CLN features” written in chart.
C106	CLO	Campylobacter-Like Organism	Rapid test for H. pylori.	CLO test positive in gastritis.
C107	CLP	Cleft Lip and Palate	Congenital orofacial malformation.	CLP repaired surgically.
C108	CLS	Cytokine-Like Syndrome	Inflammatory response condition.	CLS occurs after CAR-T therapy.
C109	CLTI	Chronic Limb-Threatening Ischemia	Severe PAD with risk of amputation.	CLTI managed by revascularization.
C110	CLV	Clinical Viral Load	Amount of virus measured.	CLV monitored in HIV patients.
C111	CM	Cardiomyopathy	Group of heart muscle diseases.	Dilated CM leads to heart failure.
C112	CMA	Chromosomal Microarray Analysis	Genetic diagnostic tool.	CMA used for developmental delay.
C113	CMC	Carboxymethylcellulose	Medical thickener/lubricant.	CMC eye drops used for dry eyes.
C114	CMF	Cyclophosphamide, Methotrexate, 5-Fluorouracil	Chemotherapy regimen.	CMF given in breast cancer.
C115	CMG	Cystometrogram	Urodynamic bladder test.	CMG performed in neurogenic bladder.
C116	CMH	Chronic Mountain Hypoxia	Long-term low oxygen condition.	CMH seen in residents at altitude.
C117	CML	Chronic Myeloid Leukemia	Hematological malignancy.	CML treated with imatinib.
C118	CMM	Cutaneous Malignant Melanoma	Skin cancer.	CMM diagnosed by biopsy.
C119	CMML	Chronic Myelomonocytic Leukemia	Myelodysplastic/myeloproliferative disorder.	CMML presents with monocytosis.
C120	CMP	Comprehensive Metabolic Panel	Routine blood chemistry panel.	CMP ordered for baseline labs.
C121	CMPI	Cow’s Milk Protein Intolerance	Pediatric allergy disorder.	CMPI causes infant colitis.
C122	CMRA	Cardiovascular Magnetic Resonance Angiography	MRI imaging of blood vessels.	CMRA used for aortic aneurysm.
C123	CMS	Centers for Medicare & Medicaid Services	US federal health insurance agency.	CMS regulates hospital billing.
C124	CMT	Charcot-Marie-Tooth Disease	Hereditary neuropathy.	CMT causes foot deformities.
C125	CMV	Cytomegalovirus	Common viral pathogen.	CMV pneumonia in transplant patient.
C126	CN	Cranial Nerve	12 pairs of nerves from brain.	CN VII palsy causes facial droop.
C127	CNI	Calcineurin Inhibitor	Class of immunosuppressants.	Tacrolimus is a CNI.
C128	CNL	Chronic Neutrophilic Leukemia	Rare myeloproliferative neoplasm.	CNL presents with neutrophilia.
C129	CNP	C-Type Natriuretic Peptide	Hormone regulating vasodilation.	CNP levels studied in CHF.
C130	CNS	Central Nervous System	Brain and spinal cord.	CNS infections include meningitis.
C131	CNV	Choroidal Neovascularization	Abnormal retinal vessel growth.	CNV seen in AMD.
C132	CO	Cardiac Output	Volume of blood pumped per minute.	Low CO in heart failure.
C133	CO2	Carbon Dioxide	Respiratory gas.	CO2 retention in COPD.
C134	COCP	Combined Oral Contraceptive Pill	Oral birth control pill.	COCP prescribed to regulate cycles.
C135	COD	Cause of Death	Reason for mortality.	COD listed on death certificate.
C136	COHb	Carboxyhemoglobin	Hemoglobin bound to CO.	COHb elevated in smoke inhalation.
C137	COM	Chronic Otitis Media	Long-term ear infection.	COM leads to hearing loss.
C138	COPD	Chronic Obstructive Pulmonary Disease	Chronic airflow limitation disease.	COPD managed with bronchodilators.
C139	COR	Clinical Outcomes Research	Medical research approach.	COR studies guide guidelines.
C140	COS	Clinical Outcome Score	Tool for disease severity.	COS used in neurology.
C141	CP	Cerebral Palsy	Childhood motor disability.	CP patient requires physiotherapy.
C142	CPA	Cerebellopontine Angle	Brain anatomical location.	CPA tumors include acoustic neuroma.
C143	CPC	Clinical Pathological Conference	Teaching session in hospitals.	CPC presented in grand rounds.
C144	CPD	Chronic Pulmonary Disease	Long-standing lung disorder.	CPD overlaps with COPD.
C145	CPE	Carbapenemase-Producing Enterobacteriaceae	Multidrug-resistant bacteria.	CPE outbreak in ICU.
C146	CPK	Creatine Phosphokinase	Muscle enzyme marker.	CPK elevated in rhabdomyolysis.
C147	CPL	Chronic Pain Location	Pain assessment term.	CPL documented in notes.
C148	CPM	Critical Pathway Methodology	Clinical management tool.	CPM used in stroke rehab.
C149	CPN	Common Peroneal Nerve	Peripheral nerve in leg.	CPN injury causes foot drop.
C150	CPP	Cerebral Perfusion Pressure	Pressure driving brain blood flow.	CPP maintained in head injury.
C151	CPR	Cardiopulmonary Resuscitation	Life-saving emergency procedure.	CPR performed in cardiac arrest.
C152	CPS	Child Protective Services	US social service agency.	CPS called for suspected abuse.
C153	CPT	Current Procedural Terminology	Medical billing codes.	CPT code used for insurance claims.
C154	CPX	Cardiopulmonary Exercise Testing	Stress test for fitness evaluation.	CPX used in CHF patients.
C155	CR	Complete Response	Absence of disease after treatment.	CR achieved after chemotherapy.
C156	CRAB	Calcium, Renal failure, Anemia, Bone lesions	Diagnostic features of myeloma.	CRAB criteria used in MM diagnosis.
C157	CRBSI	Catheter-Related Bloodstream Infection	ICU-related infection.	CRBSI prevented with sterile care.
C158	CRD	Chronic Respiratory Disease	Long-term airway/lung disorder.	CRD seen in smokers.
C159	CRF	Chronic Renal Failure	Advanced CKD stage.	CRF patients need dialysis.
C160	CRH	Corticotropin-Releasing Hormone	Hypothalamic hormone.	CRH stimulates ACTH release.
C161	CRI	Chronic Renal Insufficiency	Early CKD stage.	CRI monitored by serum creatinine.
C162	CRISPR	Clustered Regularly Interspaced Short Palindromic Repeats	Gene-editing tool.	CRISPR research in genetic diseases.
C163	CRP	C-Reactive Protein	Inflammatory marker.	High CRP in infection.
C164	CRT	Cardiac Resynchronization Therapy	Biventricular pacing treatment.	CRT improves CHF outcomes.
C165	CRVO	Central Retinal Vein Occlusion	Eye vascular blockage.	CRVO causes sudden vision loss.
C166	CS	Caesarean Section	Surgical delivery method.	CS performed for fetal distress.
C167	CSA	Central Sleep Apnea	Sleep disorder with absent effort.	CSA diagnosed on polysomnography.
C168	CSF	Cerebrospinal Fluid	Fluid around brain/spinal cord.	CSF analyzed in meningitis.
C169	CSG	Clinical Skills Group	Medical education setting.	CSG session conducted weekly.
C170	CSI	Cardiac Stress Imaging	Imaging under stress.	CSI ordered for ischemia.
C171	CSII	Continuous Subcutaneous Insulin Infusion	Insulin pump therapy.	CSII used in type 1 diabetes.
C172	CSL	Chronic Simple Laryngitis	Long-term throat inflammation.	CSL linked to smoking.
C173	CSLT	Circadian Sleep Latency Test	Sleep disorder evaluation.	CSLT used for narcolepsy.
C174	CSM	Clinical Skills Module	Medical education course.	CSM added in residency.
C175	CSO	Clinical Safety Officer	Hospital safety role.	CSO ensures compliance.
C176	CSP	Cerebrospinal Pressure	Pressure inside CSF.	CSP measured in lumbar puncture.
C177	CSR	Clinical Study Report	Formal trial documentation.	CSR submitted to FDA.
C178	CSS	Clinical Scoring System	Diagnostic grading tool.	CSS used in dermatology.
C179	CST	Cortisol Stimulation Test	Adrenal function test.	CST done in Addison’s disease.
C180	CSV	Cerebral Small Vessel disease	Neurological vascular disorder.	CSV seen on brain MRI.
C181	CT	Computed Tomography	Cross-sectional imaging.	CT chest shows nodules.
C182	CTA	Computed Tomography Angiography	CT scan of vessels.	CTA used in PE diagnosis.
C183	CTCAE	Common Terminology Criteria for Adverse Events	Oncology grading system.	CTCAE grades chemo side effects.
C184	CTC	Circulating Tumor Cells	Biomarkers in cancer.	CTC count predicts prognosis.
C185	CTD	Connective Tissue Disease	Autoimmune systemic disease.	CTD includes lupus, scleroderma.
C186	CTE	Chronic Traumatic Encephalopathy	Brain damage from repeated trauma.	CTE seen in athletes.
C187	CTG	Cardiotocography	Fetal monitoring technique.	CTG used in labor.
C188	CTH	CT Head	Brain CT scan.	CTH ordered for stroke.
C189	CTLA-4	Cytotoxic T-Lymphocyte Antigen-4	Immune checkpoint molecule.	CTLA-4 targeted in immunotherapy.
C190	CTL	Cytotoxic T Lymphocyte	Immune cell type.	CTLs kill virus-infected cells.
C191	CTM	Continue To Monitor	Note in patient chart.	“CTM vitals” written in ICU.
C192	CTP	Child-Turcotte-Pugh	Liver disease severity score.	CTP grade B cirrhosis.
C193	CTR	Carpal Tunnel Release	Surgery for carpal tunnel syndrome.	CTR relieves hand numbness.
C194	CTS	Carpal Tunnel Syndrome	Nerve compression disorder.	CTS causes wrist pain.
C195	CTV	Computed Tomography Venography	CT imaging of veins.	CTV detects DVT.
C196	CU	Copper	Trace element.	CU deficiency causes anemia.
C197	CUA	Calcium Urinary Analysis	Kidney stone risk test.	CUA used in metabolic workup.
C198	CVD	Cardiovascular Disease	Group of heart/vascular conditions.	CVD is the leading cause of death.
C199	CVP	Central Venous Pressure	Pressure in vena cava.	CVP measured in ICU.
C200	CVT	Cerebral Venous Thrombosis	Brain venous clot.	CVT causes headache and seizures.