ICD-10-CM Alphabetic Index · FY 2026 148 Entries
Reaction in the ICD-10-CM Index ICD-10-CM
The main term Reaction carries 148 index entries pointing to 57 ICD-10-CM codes. Every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
148
Index Entries
57
Codes Referenced
—
Default Code
R
Letter
148 of 148 shown
ICD-10-CM
Index Entries Under Reaction 148 entries · 57 codes
Reaction
adaptation see Disorder, adjustment
adjustment (anxiety) (conduct disorder) (depressiveness) (distress) see Disorder, adjustment
with
mutism, elective (child) (adolescent) F94.0
adverse
food (any) (ingested) NEC T78.19 Non-billable
anaphylactic see Shock, anaphylactic, due to food
affective see Disorder, mood
allergic see Allergy
anaphylactic see Shock, anaphylactic
anaphylactoid see Shock, anaphylactic
anesthesia see Anesthesia, complication
antitoxin (prophylactic) (therapeutic) see Complications, vaccination
anxiety F41.1
Arthus see Arthus' phenomenon
asthenic F48.8
combat and operational stress F43.0
compulsive F42.8
conversion F44.9
crisis, acute F43.0
deoxyribonuclease (DNA) (DNase) hypersensitivity D69.2
depressive (single episode) F32.9
affective (single episode) F31.4
recurrent episode F33.9
neurotic F34.1
psychoneurotic F34.1
psychotic F32.3
recurrent see Disorder, depressive, recurrent
dissociative F44.9
drug NEC T88.7 Non-billable
addictive see Dependence, drug
transmitted via placenta or breast milk see Absorption, drug, addictive, through placenta
allergic see Allergy, drug
lichenoid L43.2
newborn P93.8
gray baby syndrome P93.0
overdose or poisoning (by accident) see Table of Drugs and Chemicals, by drug, poisoning
photoallergic L56.1
phototoxic L56.0
withdrawal see Dependence, by drug, with, withdrawal
infant of dependent mother P96.1
newborn P96.1
wrong substance given or taken (by accident) see Table of Drugs and Chemicals, by drug, poisoning
fear F40.9
child (abnormal) F93.8
febrile nonhemolytic transfusion (FNHTR) R50.84
fluid loss, cerebrospinal G97.1
foreign
body NEC see Granuloma, foreign body
in operative wound (inadvertently left) see Foreign body, accidentally left during a procedure
substance accidentally left during a procedure (chemical) (powder) (talc) T81.60 Non-billable
aseptic peritonitis T81.61 Non-billable
body or object (instrument) (sponge) (swab) see Foreign body, accidentally left during a procedure
specified reaction NEC T81.69 Non-billable
grief see Disorder, adjustment
Herxheimer's R68.89
hyperkinetic see Hyperkinesia
hypochondriacal F45.20
hypoglycemic, due to insulin E16.0
with coma (diabetic) see Diabetes, coma
nondiabetic E15
therapeutic misadventure
hypomanic F30.8
hysterical F44.9
immunization see Complications, vaccination
incompatibility
ABO blood group (infusion) (transfusion) see Complication(s), transfusion, incompatibility reaction, ABO
delayed serologic T80.39 Non-billable
minor blood group (Duffy) (E) (K) (Kell) (Kidd) (Lewis) (M) (N) (P) (S) T80.89 Non-billable
Rh (factor) (infusion) (transfusion) see Complication(s), transfusion, incompatibility reaction, Rh (factor)
inflammatory see Infection
infusion see Complications, infusion
inoculation (immune serum) see Complications, vaccination
insulin T38.3 Non-billable
involutional psychotic see Disorder, depressive
leukemoid D72.823
basophilic D72.823
lymphocytic D72.823
monocytic D72.823
myelocytic D72.823
neutrophilic D72.823
LSD (acute)
due to drug abuse see Abuse, drug, hallucinogen
due to drug dependence see Dependence, drug, hallucinogen
lumbar puncture G97.1
manic-depressive see Disorder, bipolar
neurasthenic F48.8
neurogenic see Neurosis
neurotic F48.9
neurotic-depressive F34.1
nitritoid see Crisis, nitritoid
nonspecific
to
cell mediated immunity measurement of gamma interferon antigen response without active tuberculosis R76.12
QuantiFERON-TB test (QFT) without active tuberculosis R76.12
tuberculin test R76.11 see also Reaction, tuberculin skin test
obsessive-compulsive F42.8
organic, acute or subacute see Delirium
paranoid (acute) F23
chronic F22
senile F03 Non-billable
passive dependency F60.7
phobic F40.9
post-traumatic stress, uncomplicated Z73.3
psychogenic F99
psychoneurotic see also Neurosis
compulsive F42.8
depersonalization F48.1
depressive F34.1
hypochondriacal F45.20
neurasthenic F48.8
obsessive F42.8
psychophysiologic see Disorder, somatoform
psychosomatic see Disorder, somatoform
psychotic see Psychosis
scarlet fever toxin see Complications, vaccination
schizophrenic F23
acute (brief) (undifferentiated) F23
latent F21
undifferentiated (acute) (brief) F23
serological for syphilis see Serology for syphilis
serum T80.69 Non-billable
specified reaction NEC
due to
administration of blood and blood products T80.61 Non-billable
immunization T80.62 Non-billable
serum specified NEC T80.69 Non-billable
vaccination T80.62 Non-billable
situational see Disorder, adjustment
somatization see Disorder, somatoform
spinal puncture G97.1
dural G97.1
stress (severe) F43.9
acute (agitation) ("daze") (disorientation) (disturbance of consciousness) (flight reaction) (fugue) F43.0
specified NEC F43.89
surgical procedure see Complications, surgical procedure
tetanus antitoxin see Complications, vaccination
toxic, to local anesthesia T88.59 Non-billable
in labor and delivery O74.4
in pregnancy O29.3X Non-billable
postpartum, puerperal O89.3
toxin-antitoxin see Complications, vaccination
transfusion (blood) (bone marrow) (lymphocytes) (allergic) see Complications, transfusion
tuberculin skin test, abnormal R76.11
vaccination (any) see Complications, vaccination
withdrawing, child or adolescent F93.8
The info icon previews the code's description and billable status; the code link opens its full page with all notations.
Related Index Terms
AbsorptionAbuseCrisisForeign bodyGranulomaSerology for syphilisShockAll index terms starting with RIndex to Diseases and InjuriesICD-10-CM Code Lookup
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
