1. CA 125 test
  2. CABG, also known asCoronary bypass surgery)
  3. Calendar method for natural family planning, also known asRhythm method for natural family planning)
  4. Canalith repositioning procedure
  5. Cancer rehabilitation
  6. Cancer treatment
  7. Capsule endoscopy
  8. Capsule enteroscopy, also known asCapsule endoscopy)
  9. Cardiac ablation
  10. Cardiac calcium scoring CT, also known asHeart scan (coronary calcium scan))
  11. Cardiac catheterization
  12. Cardiac rehabilitation
  13. Cardiac resynchronization therapy
  14. Cardioversion
  15. Carotid angioplasty and stenting
  16. Carotid endarterectomy
  17. Carotid ultrasound
  18. CAT scan, also known asCT scan)
  19. Cataract surgery
  20. Catheter ablation, also known asCardiac ablation)
  21. CBC, also known asComplete blood count (CBC))
  22. CBT, also known asCognitive behavioral therapy)
  23. Cervical mucus method for natural family planning
  24. Cervical spine surgery, child, also known asPediatric cervical spine surgery)
  25. Cervicoplasty, also known asNeck lift)
  26. Cesarean section, also known asC-section)
  27. Chemical peel
  28. Chemotherapy
  29. Chemotherapy for breast cancer
  30. Chest masculinization surgery, also known asTop surgery for transgender men and nonbinary people)
  31. Chest X-rays
  32. Chiropractic adjustment
  33. Cholecystectomy (gallbladder removal)
  34. Cholescintigraphy, also known asHIDA scan)
  35. Cholesterol test
  36. Choline C-11 PET scan
  37. Chorionic villus sampling
  38. Circumcision (male)
  39. Cochlear implants
  40. Cognitive behavioral therapy
  41. Colectomy
  42. Cologuard test, also known asStool DNA test)
  43. Colonoscopy
  44. Colposcopy
  45. Combination birth control pills
  46. Complementary and alternative medicine, also known asIntegrative medicine)
  47. Complete blood count (CBC)
  48. Complete cholesterol test, also known asCholesterol test)
  49. Computer-assisted brain surgery
  50. Computerized tomography, also known asCT scan)
  51. Computerized tomography (CT) urogram
  52. Computerized tomography coronary angiogram, also known asCT coronary angiogram)
  53. Computerized tomography urogram, also known asComputerized tomography (CT) urogram)
  54. Concussion testing
  55. Contraceptive implant
  56. Convalescent plasma therapy
  57. Copper intrauterine device method, also known asCopper IUD (ParaGard))
  58. Copper IUD (ParaGard)
  59. Cordocentesis
  60. Cornea transplant
  61. Coronary angiogram
  62. Coronary angioplasty and stents
  63. Coronary artery bypass graft, also known asCoronary bypass surgery)
  64. Coronary bypass surgery
  65. Coronary calcium scan, also known asHeart scan (coronary calcium scan))
  66. Coronary CT angiogram, also known asCT coronary angiogram)
  67. Coronavirus disease 2019 antibody testing, also known asCOVID-19 antibody testing)
  68. Coronavirus disease 2019 diagnostic testing, also known asCOVID-19 tests)
  69. Cortisone shots
  70. Cosmetic ear surgery, also known asOtoplasty)
  71. Cosmetic surgery
  72. COVID-19 antibody testing
  73. COVID-19 serology testing, also known asCOVID-19 antibody testing)
  74. COVID-19 tests
  75. C-reactive protein test
  76. Creatinine tests
  77. CRP test, also known asC-reactive protein test)
  78. Cryoablation for cancer
  79. Cryotherapy for cancer, also known asCryoablation for cancer)
  80. Cryotherapy for prostate cancer
  81. C-section
  82. CT coronary angiogram
  83. CT scan
  84. Cystectomy, also known asBladder removal surgery (cystectomy))
  85. Cystoscopy
  86. Cystourethroscopy, also known asCystoscopy)
  87. Cytochrome P450 (CYP450) genotyping test, also known asCytochrome P450 tests)
  88. Cytochrome P450 tests
  89. Cytology, urine, also known asUrine cytology)
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