- Occipital/mandibular support, cervical, L0160
- Ocrelizumab, J2350
- Ocriplasmin, J7316
- Octafluoropropane, Q9956
- Octagam, J1568
- Octreotide acetate, J2353, J2354
- Ocular prosthetic implant, L8610
- Ofatumumab, J9302
- Olanzapine, J2358
- Olaratumab, J9285
- Omacetaxine Mepesuccinate, J9262
- Omadacycline, J0121
- Omalizumab, J2357
- Omegaven, B4187
- OnabotulinumtoxinA, J0585
- Ondansetron HCl, J2405
- Ondansetron oral, Q0162
- One arm, drive attachment, K0101
- Oprelvekin, J2355
- O & P supply/accessory/service, L9900
- Oral device/appliance, E0485-E0486
- Oral interface, A7047
- Oral/nasal mask, A7027
- nasal pillows, A7029
- oral cushion, A7028
- Oritavancin, J2406, J2407
- Oropharyngeal suction catheter, A4628
- Orphenadrine, J2360
- Orthopedic shoes
- arch support, L3040-L3100
- footwear, L3201-L3265
- insert, L3000-L3030
- lift, L3300-L3334
- miscellaneous additions, L3500-L3595
- positioning device, K1015, L3140-L3170
- transfer, L3600-L3649
- wedge, L3340-L3420
- Orthotic additions
- carbon graphite lamination, L2755
- fracture, L2180-L2192, L3995
- halo, L0860
- lower extremity, L2200-L2999, L4320
- ratchet lock, L2430
- scoliosis, L1010-L1120, L1210-L1290
- shoe, L3300-L3595, L3649
- spinal, L0970-L0984
- upper limb, L3810-L3890, L3970-L3974, L3995
- Orthotic devices
- ankle-foot (AFO; see also Orthopedic shoes), E1815, E1816, E1830, L1900-L1990,
- L2102-L2116, L3160, L4361
- anterior-posterior-lateral, L0700, L0710
- cervical, L0100-L0200
- cervical-thoracic-lumbar-sacral (CTLSO), L0700, L0710
- elbow (EO), E1800, E1801, L3700-L3740, L3760-L3761
- fracture, L2102-L2136, L3980-L3986
- halo, L0810-L0830
- hand, finger, prefabricated, L3923
- hand, (WHFO), E1805, E1825, L3807, L3900-L3954
- hip (HO), L1600-L1690
- hip-knee-ankle-foot (HKAFO), L2040-L2090
- interface material, E1820
- knee (KO), E1810, E1811, L1800-L1885
- knee-ankle-foot (KAFO; see also Orthopedic shoes), L2000-L2038, L2126-L2136
- Legg Perthes, L1700-L1755
- multiple post collar, L0180-L0200
- not otherwise specified, L0999, L1499, L2999, L3999, L5999, L7499, L8039, L8239
- pneumatic splint, L4350-L4380
- pronation/supination, E1818
- repair or replacement, L4000-L4210
- replace soft interface material, L4390-L4394
- sacroiliac, L0600-L0620
- scoliosis, L1000 – L1499
- shoe, see Orthopedic shoes
- shoulder (SO), L1840, L3650, L3674
- shoulder-elbow-wrist-hand (SEWHO), L3960-L3978
- side bar disconnect, L2768
- spinal, cervical, L0100-L0200
- spinal, DME, K0112-K0116
- thoracic, L0210
- thoracic-hip-knee-ankle (THKO), L1500-L1520
- toe, E1830
- wrist-hand-finger (WHFO), E1805, E1806, E1825, L3900-L3954
- Orthovisc, J7324
- Ossicula prosthetic implant, L8613
- Osteogenesis stimulator, E0747-E0749, E0760
- Ostomy
- accessories, A5093
- belt, A4396
- pouches, A4416-A4435
- skin barrier, A4401-A4449
- supplies, A4361- A4421, A5051-A5149
- Oxacillin sodium, J2700
- Oxaliplatin, J9263
- Oxygen
- ambulance, A0422
- battery charger, E1357
- battery pack/cartridge, E1356
- catheter, transtracheal, A7018
- chamber, hyperbaric, topical, A4575
- concentrator, E1390-E1391
- delivery system (topical) E0446
- DC power adapter, E1358
- Liquid oxygen system, E0433
- mask, A4620
- medication supplies, A4611-A4627
- rack/stand, E1355
- regulator, E1352, E1353
- respiratory equipment/supplies, A4611-A4627, E0424-E0480
- supplies and equipment, E0425-E0444, E0455
- tent, E0455
- tubing, A4616
- water vapor enriching system, E1405, E1406
- wheeled cart, E1354
- Oxymorphone HCl, J2410
- Oxytetracycline HCl, J2460
- Oxytocin, J2590