Classification-Index

Classification 2025 Summer Edition

Worldwide source of medical classification resources

Because of a lapse in government funding, the information on this website may not be up to date, transactions submitted via the website may not be processed, and the agency may not be able to respond to inquiries until appropriations are enacted. The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit cc.nih.gov. Updates regarding government operating status and resumption of normal operations can be found at opm.gov.

Class Index

← Previous

...

Optic Papilla See Optic Disk

Optic Papilla Edema See Papilledema

Optic Tectum See Superior Colliculi

Optical Coherence Tomography See Tomography, Optical Coherence

Optical Concepts See Optical Phenomena

Optical Fibers

General

QC 447.9 - QC 448.2

Biomedical applications

QT 37

Used in endoscopy

WB 141

Used in specific types of endoscopy, with the specific type

See also Fiber Optic Technology

Optical Illusions WW 105

Optical Imaging WN 195

Optical Microscopy See Microscopy

Optical Phenomena

General

QC 350 - QC 467

Optical Phenomenon See Optical Phenomena

Optical Process See Optical Phenomena

Optical Processes See Optical Phenomena

Optical Readers See Electronic Data Processing

Optical Rotatory Dispersion

Physical chemistry

QD 473

Optical Storage Devices

General (medical)

W 26.55.C7

(Form number 26.5 in any NLM schedule where applicable)

Optical Tomography See Tomography, Optical

Opticianry See Opticians

Opticians

As a profession

WW 21.7

Biography

Collective

WZ 112.5.A2

Individual

WZ 100

Optics and Photonics

General

QC 350 - QC 467

As a profession

QC 29

See also Optical Phenomena

Optimax See Tryptophan

Optimil See Methaqualone

Optimum Population See Population Dynamics

Optometrists

General

WW 21.7

Biography

Collective

WZ 112.5.O7

Individual

WZ 100

Optometry

General

WW 350

As a profession

WW 21.7

Or-pen See Penicillin G

Ora Serrata See Retina

Orabet See Tolbutamide

Oradexon See Dexamethasone

Oral Administration See Administration, Oral

Oral and Maxillofacial Pathology See Pathology, Oral

Oral and Maxillofacial Surgeons

General

WU 21

Biography

Collective

WZ 112.5.D3

Individual

WZ 100

Oral Cancer See Mouth Neoplasms

Oral Cavity See Mouth

Oral Cavity Proper See Mouth

Oral Cavity Squamous Cell Carcinoma See Squamous Cell Carcinoma of Head and Neck

Oral Character See Psychoanalytic Theory

Oral Contraceptive See Contraceptives, Oral

Oral Contraceptive Agents, Hormonal See Contraceptives, Oral, Hormonal

Oral Contraceptive Agents, Sequential See Contraceptives, Oral, Sequential

Oral Contraceptives See Contraceptives, Oral

Oral Contraceptives, Combined See Contraceptives, Oral, Combined

Oral Contraceptives, Hormonal See Contraceptives, Oral, Hormonal

Oral Contraceptives, Low-Dose See Contraceptives, Oral

Oral Contraceptives, Phasic See Contraceptives, Oral

Oral Contraceptives, Sequential See Contraceptives, Oral, Sequential

Oral Diagnosis See Diagnosis, Oral

Oral Drug Administration See Administration, Oral

Oral Dyskinesia See Dyskinesias

Oral Examination See Diagnosis, Oral