nature_code	nature_text	display_level	selectable	sort_sequence
000000	All natures	0	T	1
10XXXX	Traumatic injuries and disorders, unspecified	2	T	3
110XXX	Traumatic injuries to bones, nerves, spinal cord, unspecified	3	T	5
111XXX	Fractures	3	T	6
1121XX	Paralysis, paraplegia, quadriplegia	4	T	9
1129XX	Traumatic injuries to spinal cord, n.e.c.	4	T	10
112XXX	Traumatic injuries to spinal cord	3	T	7
1130XX	Traumatic injuries to nerves, except the spinal cord, unspecified	4	T	12
1131XX	Pinched nerve	4	T	13
1139XX	Traumatic injuries to nerves, except the spinal cord, n.e.c.	4	T	14
113XXX	Traumatic injuries to nerves, except the spinal cord	3	T	11
118XXX	Multiple traumatic injuries to bones, nerves, spinal cord	3	T	15
119XXX	Traumatic injuries to bones, nerves, spinal cord, n.e.c.	3	T	16
11XXXX	Traumatic injuries to bones, nerves, spinal cord	2	T	4
120XXX	Traumatic injuries to muscles, tendons, ligaments, joints, etc., unspecified	3	T	18
1210XX	Dislocations, unspecified	4	T	20
1211XX	Herniated discs	4	T	21
1212XX	Dislocation of joints	4	T	22
1219XX	Dislocations, n.e.c.	4	T	24
121XXX	Dislocations	3	T	19
1220XX	Cartilage fractures and tears, unspecified	4	T	26
1221XX	Meniscus tears	4	T	27
1229XX	Cartilage fractures and tears, n.e.c.	4	T	28
122XXX	Cartilage fractures and tears	3	T	25
1230XX	Sprains, strains, tears, unspecified	4	T	30
1231XX	Major tears to muscles, tendons, ligaments	4	T	31
1232XX	Sprains	4	T	32
1233XX	Strains	4	T	33
1238XX	Multiple sprains, strains, tears	4	T	34
123XXX	Sprains, strains, tears	3	T	29
124XXX	Hernias due to traumatic incidents	3	T	35
125XXX	Whiplash	3	T	36
128XXX	Multiple traumatic injuries to muscles, tendons, ligaments, joints, etc.	3	T	37
129XXX	Traumatic injuries to muscles, tendons, ligaments, joints, etc., n.e.c.	3	T	38
12XXXX	Traumatic injuries to muscles, tendons, ligaments, joints, etc.	2	T	17
130XXX	Open wounds, unspecified	3	T	40
1311XX	Amputations	4	T	43
1312XX	Avulsions, enucleations	4	T	44
1319XX	Amputations, avulsions, enucleations, n.e.c.	4	T	45
131XXX	Amputations, avulsions, enucleations	3	T	41
132XXX	Cuts, lacerations	3	T	46
133XXX	Puncture wounds, except gunshot wounds	3	T	47
134XXX	Gunshot wounds	3	T	48
138XXX	Multiple types of open wounds	3	T	49
139XXX	Open wounds, n.e.c.	3	T	50
13XXXX	Open wounds	2	T	39
140XXX	Surface wounds and bruises, unspecified	3	T	52
141XXX	Abrasions, scratches	3	T	53
142XXX	Blisters	3	T	54
143XXX	Bruises, contusions	3	T	55
148XXX	Multiple surface wounds and bruises	3	T	56
149XXX	Surface wounds and bruises, n.e.c.	3	T	57
14XXXX	Surface wounds and bruises	2	T	51
150XXX	Burns and corrosions, unspecified	3	T	59
1510XX	Chemical burns and corrosions, unspecified	4	T	61
1511XX	First degree chemical burns and corrosions	4	T	62
1512XX	Second degree chemical burns and corrosions	4	T	63
1513XX	Third or fourth degree chemical burns and corrosions	4	T	64
1519XX	Chemical burns and corrosions, n.e.c.	4	T	65
151XXX	Chemical burns and corrosions	3	T	60
1520XX	Heat (thermal) burns, unspecified	4	T	67
1521XX	First degree heat (thermal) burns	4	T	68
1522XX	Second degree heat (thermal) burns	4	T	69
1523XX	Third or fourth degree heat (thermal) burns	4	T	70
1529XX	Heat (thermal) burns, n.e.c.	4	T	71
152XXX	Heat (thermal) burns	3	T	66
1530XX	Electrical burns, unspecified	4	T	73
1531XX	First degree electrical burns	4	T	74
1532XX	Second degree electrical burns	4	T	75
1533XX	Third or fourth degree electrical burns	4	T	76
1539XX	Electrical burns, n.e.c.	4	T	77
153XXX	Electrical burns	3	T	72
1590XX	Other burns, unspecified	4	T	79
1591XX	Other burns, first degree	4	T	80
1599XX	Other burns, n.e.c.	4	T	83
159XXX	Other burns	3	T	78
15XXXX	Burns and corrosions	2	T	58
160XXX	Intracranial injuries, unspecified	3	T	85
161XXX	Cerebral and other intracranial hemorrhages	3	T	86
162XXX	Concussions	3	T	87
168XXX	Multiple types of intracranial injuries	3	T	88
169XXX	Intracranial injuries, n.e.c.	3	T	92
16XXXX	Intracranial injuries	2	T	84
1710XX	Effects of reduced temperature, unspecified	4	T	96
1711XX	Frostbite	4	T	97
171XXX	Effects of reduced temperature	3	T	95
1720XX	Effects of heat and light, unspecified	4	T	102
1721XX	Heat stroke	4	T	103
1722XX	Heat syncope	4	T	104
1723XX	Heat fatigue	4	T	105
1725XX	Heat exhaustion, prostration	4	T	107
1729XX	Effects of heat and light, n.e.c.	4	T	109
172XXX	Effects of heat and light	3	T	101
1730XX	Effects of air or water pressure, unspecified	4	T	111
1739XX	Effects of air or water pressure, n.e.c.	4	T	116
173XXX	Effects of air or water pressure	3	T	110
17XXXX	Effects of environmental conditions	2	T	93
180XXX	Multiple traumatic injuries and disorders, unspecified	3	T	120
181XXX	Cuts and abrasions or bruises	3	T	121
1820XX	Sprains and other injuries, unspecified	4	T	123
1821XX	Sprains and bruises	4	T	124
1822XX	Sprains and cuts	4	T	125
1829XX	Sprains and other injuries, n.e.c.	4	T	126
182XXX	Sprains and other injuries	3	T	122
1830XX	Fractures and other injuries, unspecified	4	T	128
1831XX	Fractures (except skull fractures) and concussions	4	T	129
1832XX	Fractures (except rib, trunk fractures) and internal injuries	4	T	130
1833XX	Fractures and burns	4	T	131
1834XX	Fractures and dislocations	4	T	132
1839XX	Fractures and other injuries, n.e.c.	4	T	133
183XXX	Fractures and other injuries	3	T	127
1849XX	Burns and other injuries, n.e.c.	4	T	137
184XXX	Burns and other injuries, except fractures	3	T	134
189XXX	Multiple traumatic injuries and disorders, n.e.c.	3	T	139
18XXXX	Multiple traumatic injuries and disorders	2	T	119
190XXX	Other traumatic injuries and disorders, unspecified	3	T	141
191XXX	Asphyxiations, strangulations, suffocations	3	T	142
193XXX	Electrocutions, electric shocks	3	T	144
194XXX	Internal injuries to organs and blood vessels of the trunk	3	T	145
1950XX	Dermatitis and reactions affecting the skin--acute, unspecified	4	T	147
1951XX	Allergic dermatitis--acute	4	T	148
1952XX	Irritant dermatitis--acute	4	T	149
1953XX	Hives, urticaria--acute	4	T	150
1958XX	Multiple types of dermatitis and skin reactions--acute	4	T	151
1959XX	Dermatitis and reactions affecting the skin--acute, n.e.c.	4	T	152
195XXX	Dermatitis and reactions affecting the skin--acute	3	T	146
1960XX	Poisoning, toxic, noxious, or allergenic effect, unspecified	4	T	154
1961XX	Poisoning, including poisoning-related asphyxia	4	T	155
1962XX	Anaphylactic shock, anaphylaxis	4	T	156
1963XX	Other respiratory system symptoms--toxic, noxious, or allergenic effect	4	T	157
1964XX	Coughing and throat irritation-- toxic, noxious, or allergenic effect	4	T	158
1965XX	Dizziness, lightheadedness, headache--toxic, noxious, or allergenic effect	4	T	159
1966XX	Other or unspecified allergic reactions	4	T	160
1967XX	Nausea, vomiting-- toxic, noxious, or allergenic effect	4	T	161
1968XX	Multiple poisoning, toxic, noxious, or allergenic effects	4	T	162
1969XX	Other poisoning, toxic, noxious, or allergenic effects, n.e.c.	4	T	163
196XXX	Other poisoning, toxic, noxious, or allergenic effects	3	T	153
1971XX	Crushing injuries	4	T	165
1972XX	Soreness, pain, hurt--nonspecified injury	4	T	166
1973XX	Swelling, inflammation, irritation--nonspecified injury	4	T	167
1974XX	Numbness--nonspecified injury	4	T	168
1978XX	Multiple nonspecified injuries and disorders	4	T	169
1979XX	Nonspecified injuries and disorders, n.e.c.	4	T	170
197XXX	Nonspecified injuries and disorders	3	T	164
1999XX	Traumatic injuries and disorders, n.e.c.	4	T	174
199XXX	Other traumatic injuries and disorders, n.e.c.	3	T	171
19XXXX	Other traumatic injuries and disorders	2	T	140
1XXXXX	Traumatic injuries and disorders	1	T	2
20XXXX	Systemic diseases and disorders, unspecified	2	T	176
221XXX	Inflammatory diseases of the central nervous system	3	T	180
2231XX	Seizure disorder, epilepsy	4	T	184
2232XX	Migraine	4	T	185
2239XX	Other disorders of the central nervous system, n.e.c.	4	T	186
223XXX	Other disorders of the central nervous system	3	T	182
2240XX	Disorders of the peripheral nervous system, unspecified	4	T	188
2241XX	Carpal tunnel syndrome	4	T	189
2242XX	Inflammatory and toxic neuropathy, toxic polyneuropathy	4	T	190
2249XX	Disorders of the peripheral nervous system, n.e.c.	4	T	193
224XXX	Disorders of the peripheral nervous system	3	T	187
2250XX	Disorders of the eye, adnexa, vision, unspecified	4	T	195
2251XX	Conjunctivitis--non-viral	4	T	196
2252XX	Inflammation except conjunctivitis (including ophthalmia, iritis, chalazion)	4	T	197
2254XX	Blindness, low vision	4	T	199
2259XX	Disorders of the eye, adnexa, vision, n.e.c.	4	T	202
225XXX	Disorders of the eye, adnexa, vision	3	T	194
2260XX	Disorders of the ear, mastoid process, hearing, unspecified	4	T	204
2261XX	Deafness, hearing loss and impairment	4	T	205
2262XX	Tinnitus	4	T	206
2269XX	Disorders of the ear, mastoid process, and hearing, n.e.c.	4	T	207
226XXX	Disorders of the ear, mastoid process, hearing	3	T	203
22XXXX	Nervous system and sense organs diseases	2	T	178
230XXX	Circulatory system diseases, unspecified	3	T	210
232XXX	Hypertensive disease	3	T	212
2330XX	Ischemic heart disease, unspecified	4	T	214
2331XX	Myocardial infarction (heart attack)	4	T	215
233XXX	Ischemic heart disease, including heart attack	3	T	213
2359XX	Other forms of heart disease, n.e.c.	4	T	228
235XXX	Other forms of heart disease	3	T	223
2361XX	Stroke	4	T	231
236XXX	Cerebrovascular disease	3	T	229
237XXX	Diseases of arteries, arterioles, capillaries	3	T	234
238XXX	Diseases of the veins, lymphatics	3	T	239
23XXXX	Circulatory system diseases	2	T	209
240XXX	Respiratory system diseases, unspecified	3	T	247
241XXX	Acute respiratory infections (including common cold)	3	T	248
2431XX	Pneumonia	4	T	256
2432XX	Influenza--common	4	T	257
2433XX	Influenza--novel	4	T	258
243XXX	Pneumonia, influenza	3	T	254
2449XX	Chronic obstructive pulmonary diseases and allied conditions, n.e.c.	4	T	265
244XXX	Chronic obstructive pulmonary disease and allied conditions	3	T	259
2491XX	Pneumonitis, n.e.c.	4	T	279
2499XX	Other respiratory system diseases, n.e.c.	4	T	283
249XXX	Other respiratory system diseases	3	T	277
24XXXX	Respiratory system diseases	2	T	246
253XXX	Hernia--nontraumatic	3	T	288
25XXXX	Digestive system diseases and disorders	2	T	284
271XXX	Arthropathies and related disorders (arthritis)	3	T	310
2720XX	Dorsopathies, unspecified	4	T	312
2721XX	Sciatica	4	T	313
2722XX	Lumbago	4	T	314
2723XX	Disc disorders, except dislocation	4	T	315
2729XX	Dorsopathies, n.e.c.	4	T	316
272XXX	Dorsopathies	3	T	311
2730XX	Soft tissue disorder, except the back, unspecified	4	T	318
2731XX	Bursitis	4	T	319
2732XX	Stenosing tenosynovitis	4	T	320
2733XX	Other tenosynovitis, synovitis	4	T	321
2734XX	Epicondylitis	4	T	322
2735XX	Other or unspecified tendonitis (tendinitis)	4	T	323
2736XX	Ganglion or cystic tumor	4	T	324
2738XX	Multiple soft tissue disorders	4	T	325
2739XX	Soft tissue disorder, except the back, n.e.c.	4	T	326
273XXX	Soft tissue disorders, except the back	3	T	317
2749XX	Osteopathies, chondropathies, and acquired deformities, n.e.c.	4	T	330
274XXX	Osteopathies, chondropathies, and acquired deformities	3	T	327
279XXX	Musculoskeletal system and connective tissue diseases and disorders, n.e.c.	3	T	331
27XXXX	Musculoskeletal system and connective tissue diseases and disorders	2	T	308
2810XX	Infections of the skin and subcutaneous tissue, unspecified	4	T	335
2811XX	Cellulitis and abscess	4	T	336
2813XX	Methicillin-resistant staphylococcus aureus (MRSA) infection	4	T	338
2819XX	Infections of the skin and subcutaneous tissue, n.e.c.	4	T	341
281XXX	Infections of the skin and subcutaneous tissue	3	T	334
289XXX	Other diseases and disorders of the skin and subcutaneous tissue	3	T	348
28XXXX	Disorders of the skin and subcutaneous tissue	2	T	332
291XXX	Endocrine, nutritional, metabolic, and immunity disorders	3	T	357
29XXXX	Other systemic diseases and disorders	2	T	355
2XXXXX	Diseases and disorders of body systems	1	T	175
30XXXX	Infectious and parasitic diseases, unspecified	2	T	364
311XXX	Tuberculosis	3	T	367
3199XX	Other bacterial diseases, n.e.c	4	T	388
319XXX	Other bacterial diseases	3	T	379
31XXXX	Bacterial diseases	2	T	365
322XXX	Non-arthropod-borne viral diseases of the central nervous system	3	T	396
3233XX	Chickenpox, varicella	4	T	404
3234XX	Herpes zoster, shingles	4	T	405
323XXX	Viral diseases accompanied by exanthem (eruptive fever)	3	T	400
3290XX	Other diseases due to viruses, unspecified	4	T	430
3299XX	Other diseases due to viruses, n.e.c.	4	T	435
329XXX	Other diseases due to viruses	3	T	429
32XXXX	Viral diseases	2	T	389
333XXX	Lyme disease	3	T	444
33XXXX	Other arthropod-borne diseases	2	T	436
349XXX	Mycoses, n.e.c.	3	T	450
34XXXX	Mycoses (fungal infections)	2	T	446
360XXX	Infectious diseases peculiar to the intestines, unspecified	3	T	453
369XXX	Infectious diseases peculiar to the intestines, n.e.c.	3	T	460
36XXXX	Infectious diseases peculiar to the intestines	2	T	452
390XXX	Other infectious and parasitic diseases, unspecified	3	T	462
392XXX	Scabies and other acariases	3	T	464
39XXXX	Other infectious and parasitic diseases	2	T	461
3XXXXX	Infectious and parasitic diseases	1	T	363
410XXX	Malignant neoplasms and tumors (cancers, carcinomas, sarcomas)	3	T	469
41XXXX	Malignant neoplasms and tumors (cancers, carcinomas, sarcomas)	2	T	468
4XXXXX	Neoplasms, tumors, and cancers	1	T	467
50XXXX	Symptoms, signs, and ill-defined conditions, unspecified	2	T	512
510XXX	Symptoms, unspecified	3	T	514
5110XX	General symptoms, unspecified	4	T	516
5111XX	Loss of consciousness--not heat related	4	T	517
5112XX	Convulsions, seizures	4	T	518
5114XX	Dizziness--general	4	T	520
5115XX	Inflammation, swelling--general	4	T	521
5118XX	Multiple general symptoms	4	T	523
511XXX	General symptoms	3	T	515
5122XX	Earache	4	T	528
5123XX	Eye strain	4	T	529
5128XX	Multiple symptoms involving nervous and musculoskeletal systems	4	T	530
512XXX	Symptoms involving nervous and musculoskeletal systems	3	T	525
5141XX	Headache, except migraine	4	T	541
5149XX	Symptoms involving head and neck, n.e.c.	4	T	544
514XXX	Symptoms involving head and neck	3	T	539
5159XX	Symptoms involving cardiovascular system, n.e.c.	4	T	551
515XXX	Symptoms involving cardiovascular system	3	T	545
5160XX	Symptoms involving respiratory system and chest, unspecified	4	T	553
5164XX	Chest pain	4	T	557
5168XX	Multiple symptoms involving respiratory system and chest	4	T	558
5169XX	Symptoms involving respiratory system and chest, n.e.c.	4	T	559
516XXX	Symptoms involving respiratory system and chest	3	T	552
5171XX	Nausea and vomiting--general	4	T	562
517XXX	Symptoms involving digestive and urinary system	3	T	560
518XXX	Multiple symptoms	3	T	568
51XXXX	Symptoms	2	T	513
529XXX	Other abnormal findings	3	T	582
52XXXX	Abnormal findings	2	T	570
58XXXX	Multiple symptoms, signs, and ill-defined conditions	2	T	583
59XXXX	Symptoms, signs, and ill-defined conditions, n.e.c.	2	T	584
5XXXXX	Symptoms, signs, and ill-defined conditions	1	T	511
620XXX	Mental disorders and syndromes, unspecified	3	T	604
6210XX	Anxiety, stress, unspecified	4	T	606
6211XX	Post-traumatic stress disorder	4	T	607
6213XX	Anxiety or panic disorder	4	T	609
6219XX	Anxiety, stress, n.e.c.	4	T	610
621XXX	Anxiety, stress	3	T	605
62XXXX	Mental disorders and syndromes	2	T	603
69XXXX	Other diseases, conditions, and disorders, n.e.c.	2	T	613
6XXXXX	Other diseases, conditions, and disorders	1	T	585
7XXXXX	Exposures to disease -- no illness incurred	1	T	614
8XXXXX	Multiple diseases, conditions, and disorders	1	T	615
9999XX	Nonclassifiable	4	T	616