Canceled Class Numbers

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The National Library of Medicine cancels classification numbers from its schedules for a variety of reasons —most often classification numbers are realigned to better reflect their domain and improve collocation of materials on related concepts.

Since NLM does not reclassify titles when classification numbers change, materials on like subjects may not be shelved together. For example, if a user wishes to find all materials on the pharmacology of hallucinogens, titles cataloged before 1978 are shelved under QV 109 and titles cataloged 1978 and later are found under QV 77.7.

The table of canceled class numbers below lists numbers canceled from 1978 through the current year, the approximate cancellation date, and the new class number for each concept.

Note: This list does not include numbers which were, for a very brief time, used to subdivide materials by publication date. See: Changes in Classification Practice: http://www.nlm.nih.gov/class/nlmclassprac.html#Changes.

Canceled Number	Year Canceled	Subject	Now Classed in
Human Anatomy
QS 539	1994	Handbooks [Histology]	QS 529
QS 639	1994	Handbooks [Embryology]	QS 629
Physiology
QT 39	1994	Handbooks [Physiology]	QT 29
Pharmacology
QV 32.5	1981	Discussion of law, Jurisprudence, (Table G)	QV 33
QV 32.6	1981	General coverage (Not Table G)	QV 33.1
QV 67	1978	Bitters. Carminatives. Adsorbents	QV 66
QV 86	1978	Tranquilizing agents (General)	QV 77.9
QV 93	1978	Morphine substitutes, e.g., Meperidine	QV 92
QV 108	1978	Antidepressive agents	QV 77.5
QV 109	1978	Hallucinogens	QV 77.7
QV 115	2006	Synthetic local anesthetics	QV 113
QV 743	1978	Ancient and medieval remedies	QV 11; QV 11.1
QV 767	2002	Herbs	QV 766
QV 770.1	2005	Medicinal Plants (Not Table G)	QV 766
QV 790	1978	Pharmaceutical supplies	QV 26; QV 772
QV 832	1978	Laws, etc. [Packaging]	QV 32
Microbiology. Immunology
QW 115	2006	Actinobacteria	QW 125
QW 118	2006	Corynebacterum	QW 125.5.C5
QW 120	2006	Propionibacteriaceae	QW 125.5.P7
QW 130	1978	Caryophanales	[Number never used at NLM]
QW 149	2004	Rickettsiales and chlamydiales	QW 150; QW 152
QW 153	2006	Sheathed bacteria. Budding or appendaged bacteria	QW 133
QW 167	1994	Oncolytic viruses	QW 160
QW 168.5.R6	1994	RNA rodent viruses	QW 168
QW 180.5.M9	2005	Myxomycetes	QX 50
Parasitology
QX 190	1978	Toxoplasma, et al.	QX 140
QX 465	1978	Centipedes. Millipedes	QX 460
Clinical Pathology
QY 105	1978	Animal inoculation	QY 100; SF 757.2
QY 485	1978	Drugs [clinical analysis of drugs in blood]	[Number never used at NLM]
Pathology
QZ 320	1978	Tumors derived from developmental faults	QZ 310
QZ 330	1978	Tumors derived from neural elements	QZ 310
General Medicine. Health Professions
W 39	1994	Handbooks [Health Professions]	W 49
W 94	2002	Government services	[Number not used at NLM]
Practice of Medicine
WB 289	1994	Diagnostic use of ultrasonics	WN 208
WB 375	1978	Thoracentesis. Pericardial puncture	[Number never used at NLM]
Communicable Diseases
WC 169	1978	Gummatous lesions	WC 165
WC 405	1978	Rat-bite fever (Sodoku)	WC 390
WC 525	1978	Psittacosis [Ornithosis]	WC 660
WC 593	2007	Cat-scratch disease	WC 640
WC 825	1978	Cestode infections	WC 830
Respiratory System
WF 815	1978	Subdiaphragmatic abscess [Subphrenic abscess]	WI 575
Cardiovascular System
WG 595.I6	1994	Innominate artery	WG 595.B72
WG 625.I6	1994	Innominate vein	WG 625.B7
Endocrine System
WK 187	2004	Synthetic hormones	WK 150-190, etc.
WK 375	1978	Carotid body.	WL 102.9
WK 757	2004	Synthetic substitutes for cortical hormones	WK 755
Psychiatry
WM 58	1978	Psychiatric social work	WM 30.5
WM 145.5.S9	2002	Szondi test	WM 145.5.P8
WM 145.5.R8	2005	Rosenzweig picture-frustration study	WM 145.5.P8
WM 210	1978	Personality disorders [Constitutional psychopathic personality	WM 190
WM 612	1994	Masturbation	HQ 447;
WM 615	1994	Homosexuality	HQ 75-76.8; WM 611
Surgery
WO 34	1981	Malpractice	WO 33; WO 33.1
WO 295	1978	Basal Anesthesia	WO 234
Gynecology
WP 175	1978	Urethrocele. Cytocele. Rectocele	WP 180; WP 250
WP 930	1978	Radiation [Breast. Therapy]	WP 870
Obstetrics
WQ 410	1978	Preparation manipulation [Obstetrical Surgery]	WQ 415
WQ 435	2002	Embryotomy	WQ 440
Dentistry. Oral Surgery
WU 39	1994	Handbooks [Dentistry]	WU 49
Otolaryngology
WV 324	1978	Nasal fossae. Turbinates	WV 301
Hospital and other Health Facilities
WX 221	1978	X-ray services [Radiology Department, Hospital]	WN 27-28
Nursing
WY 39	1994	Handbooks [Nursing]	WY 49
History of Medicine. Medical Miscellany
WZ 29	1994	Handbooks [History of Medicine]	WZ 39
WZ 332	2009	Anniversaries and special events	[Number never used at NLM]

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Last updated: 23 April 2009
First published: 08 October 2002
Permanence Level: Permanent: Stable Content