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 cap
  24. Cervical cerclage
  25. Cervical mucus method for natural family planning
  26. Cervical spine surgery, child, also known asPediatric cervical spine surgery)
  27. Cervicoplasty, also known asNeck lift)
  28. Cesarean section, also known asC-section)
  29. Chemical peel
  30. Chemotherapy
  31. Chemotherapy for breast cancer
  32. Chest X-rays
  33. Chiropractic adjustment
  34. Cholecystectomy (gallbladder removal)
  35. Cholescintigraphy, also known asHIDA scan)
  36. Cholesterol test
  37. Choline C-11 PET scan
  38. Chorionic villus sampling
  39. Circumcision (male)
  40. Cochlear implants
  41. Cognitive behavioral therapy
  42. Colectomy
  43. Cologuard test, also known asStool DNA test)
  44. Colonoscopy
  45. Colposcopy
  46. Combination birth control pills
  47. Complementary and alternative medicine, also known asIntegrative medicine)
  48. Complete blood count (CBC)
  49. Complete cholesterol test, also known asCholesterol test)
  50. Computer-assisted brain surgery
  51. Computerized tomography, also known asCT scan)
  52. Computerized tomography (CT) urogram
  53. Computerized tomography coronary angiogram, also known asCT coronary angiogram)
  54. Computerized tomography urogram, also known asComputerized tomography (CT) urogram)
  55. Concussion testing
  56. Condom, female, also known asFemale condom)
  57. Condom, male, also known asMale condoms)
  58. Contraceptive implant
  59. Contraceptive sponge
  60. Convalescent plasma therapy
  61. Copper intrauterine device method, also known asCopper IUD (ParaGard))
  62. Copper IUD (ParaGard)
  63. Cordocentesis
  64. Cornea transplant
  65. Coronary angiogram
  66. Coronary angioplasty and stents
  67. Coronary artery bypass graft, also known asCoronary bypass surgery)
  68. Coronary bypass surgery
  69. Coronary calcium scan, also known asHeart scan (coronary calcium scan))
  70. Coronary CT angiogram, also known asCT coronary angiogram)
  71. Coronavirus disease 2019 antibody testing, also known asCOVID-19 antibody testing)
  72. Coronavirus disease 2019 diagnostic testing, also known asCOVID-19 tests)
  73. Cortisone shots
  74. Cosmetic ear surgery, also known asOtoplasty)
  75. Cosmetic surgery
  76. COVID-19 antibody testing
  77. COVID-19 serology testing, also known asCOVID-19 antibody testing)
  78. COVID-19 tests
  79. C-reactive protein test
  80. Creatinine tests
  81. CRP test, also known asC-reactive protein test)
  82. Cryoablation for cancer
  83. Cryotherapy for cancer, also known asCryoablation for cancer)
  84. Cryotherapy for prostate cancer
  85. C-section
  86. CT coronary angiogram
  87. CT scan
  88. Cystectomy, also known asBladder removal surgery (cystectomy))
  89. Cystoscopy
  90. Cytochrome P450 (CYP450) genotyping test, also known asCytochrome P450 tests)
  91. Cytochrome P450 tests
  92. Cytology, urine, also known asUrine cytology)
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