ICD-10-CM Alphabetic Index · FY 2026 Letter R
Index Terms Starting With R ICD-10-CM
Home › ICD-10-CM Codes List › Index to Diseases and Injuries › RThe letter R section of the FY 2026 Alphabetic Index carries 263 main terms , from Rabbit fever to Rytand-Lipsitch syndrome. Terms with a direct code link straight to the code page, cross references point to the main term that holds the codes, and terms with a handful of sub-entries render in full right here. The largest terms open their own full index page.
✓ Built from the official CMS FY 2026 index file Effective Oct 1, 2025 – Sep 30, 2026
Rabbit fever Cross-ref See: Tularemia inoculation reaction see Complications, vaccination
Rachischisis Cross-ref See: Spina bifida
Rachitic Sub-entries see also condition
deformities of spine (late effect) (sequelae)
E64.3 pelvis (late effect) (sequelae)
E64.3 with disproportion (fetopelvic)
O33.0 causing obstructed labor
O65.0 Rachitis, rachitism (acute) (tarda) Sub-entries see also Rickets
Radial nerve Cross-ref See: condition Radiation Sub-entries
burn see Burn
effects NOS
T66 Non-billable sickness NOS
T66 Non-billable therapy, encounter for
Z51.0 Radiculitis (pressure) (vertebrogenic) Cross-ref See: Radiculopathy Radiculomyelitis Sub-entries see also Encephalitis
toxic, due to
Corynebacterium diphtheriae
A36.82 Radiodermal burns (acute, chronic, or occupational) Cross-ref See: Burn
Radiodermatitis Sub-entries L58.9 Radiotherapy session Code Z51.0 RAEB (refractory anemia with excess blasts) Code D46.2 Non-billable Rage, meaning rabies Cross-ref See: Rabies Ragpicker's disease Code A22.1 Ragsorter's disease Code A22.1 Raillietiniasis Code B71.8 Railroad neurosis Code F48.8 Raised Sub-entries see also Elevated
Rake teeth, tooth Code M26.39 Ramifying renal pelvis Code Q63.8 Ramsay-Hunt disease or syndrome Sub-entries B02.21 see also Hunt's, disease meaning dyssynergia cerebellaris myoclonica
G11.19 adult
alleged, observation or examination, ruled out
feeble pulse, due to shock, following injury
T79.4 Non-billable second stage (delivery)
O62.3 Rarefaction, bone Cross-ref See: Disorder, bone, density and structure, specified NEC
drug (internal use)
L27.0 contact
L25.1 see also Dermatitis, due to, drugs, external Rasmussen aneurysm Cross-ref See: Tuberculosis, pulmonary
Rasmussen encephalitis Code G04.81 Rat-bite fever Sub-entries A25.9 due to Streptobacillus moniliformis
A25.1 spirochetal (morsus muris)
A25.0 Rathke's pouch tumor Code D44.3 Raymond (-Céstan) syndrome Code I65.8 Raynaud's disease, phenomenon or syndrome (secondary) Sub-entries I73.00 with gangrene (symmetric)
I73.01 RDS (newborn) (type I) Sub-entries P22.0 Reaction Sub-entries see also Disorder adaptation see Disorder, adjustment
adjustment (anxiety) (conduct disorder) (depressiveness) (distress) see Disorder, adjustment
with
mutism, elective (child) (adolescent)
F94.0 Reactive airway disease Cross-ref See: Asthma
Reactive depression Cross-ref See: Reaction, depressive chromosomal
abnormal individual (autosomal)
Q95.2 non-sex (autosomal) chromosomes
Q95.2 Recalcitrant patient Cross-ref See: Noncompliance Recanalization, thrombus Cross-ref See: Thrombosis
chamber angle (eye)
H21.55 Non-billable gingival (postinfective) (postoperative)
Recklinghausen disease Sub-entries Q85.01 Reclus' disease (cystic) Cross-ref See: Mastopathy, cystic
deficit
cerebral infarction see Sequelae, infarction, cerebral
stroke see Sequelae, infarction, cerebral
sequelae
Recrudescent typhus (fever) Code A75.1 Recruitment, auditory Code H93.21 Non-billable female (without uterine prolapse)
N81.6 with uterine prolapse
N81.4 Rectosigmoid junction Cross-ref See: condition Rectourethral Cross-ref See: condition Rectovaginal Cross-ref See: condition Rectovesical Cross-ref See: condition Rectum, rectal Cross-ref See: condition Recurrent Sub-entries see condition
pregnancy loss see Loss (of), pregnancy, recurrent
Red tide Code T65.82 Non-billable See also: Table of Drugs and Chemicals Red-cedar lung or pneumonitis Code J67.8 Reduced Sub-entries
ventilatory or vital capacity
R94.2 foreskin (congenital)
N47.8 Reduplication Cross-ref See: Duplication
pupillary, abnormal see Anomaly, pupil, function
with esophagitis (without bleeding)
K21.00 Reforming, artificial openings Cross-ref See: Attention to, artificial, opening Refractive error Cross-ref See: Disorder, refraction
Refsum's disease or syndrome Code G60.1 left against medical advice (AMA)
Z53.29 left without being seen
Z53.21 Regional Cross-ref See: condition aortic (valve) see Insufficiency, aortic
food see also Vomiting
with reswallowing see Rumination
Reichmann's disease or syndrome Code K31.89 Reifenstein syndrome Code E34.52 Reinsertion Sub-entries
implantable subdermal contraceptive
Z30.46 intrauterine contraceptive device
Z30.433 foot joint
M02.37 Non-billable hand joint
M02.34 Non-billable Dutton's (West African)
A68.1 louse-borne (epidemic)
A68.0 Relationship Sub-entries
arch (foot) see also Deformity, limb, flat foot
back ligaments see Instability, joint, spine
Release from prison, anxiety concerning Code Z65.2 Remains Sub-entries
Remittent fever (malarial) Code B54 cervix, cervical stump (acquired) (postoperative)
N88.8 cystic duct, postcholecystectomy
K91.5 Ren Sub-entries
Renal Cross-ref See: condition Rendu-Osler-Weber disease or syndrome Code I78.0 Reninoma Code D41.0 Non-billable Renon-Delille syndrome Code E23.3 Reovirus, as cause of disease classified elsewhere Code B97.5 Repeated falls NEC Code R29.6 Replaced chromosome by dicentric ring Code Q93.2 Request for expert evidence Code Z04.89 Reserve, decreased or low Sub-entries
cardiac see Disease, heart
Residing Sub-entries
in place not meant for human habitation (abandoned building) (car) (park) (sidewalk)
Z59.02 Residual Sub-entries see also condition
state, schizophrenic
F20.5 complicating pregnancy
O26.89 Non-billable Resorption Sub-entries
teeth (external) (internal) (pathological) (roots)
K03.3 decreased due to shock, following injury
T79.4 Non-billable disorder of, psychogenic
F45.8 Respiratory Sub-entries see also condition
distress syndrome (newborn) (type I)
P22.0 syncytial virus, as cause of disease classified elsewhere
B97.4 see also Virus, respiratory syncytial (RSV) Response (drug) Sub-entries
stent
vascular
end stent
adjacent to stent see Arteriosclerosis
Restless legs (syndrome) Code G25.81 dental
aesthetically inadequate or displeasing
K08.56 Restriction Sub-entries
Rests, ovarian, in fallopian tube Code Q50.6 Restzustand (schizophrenic) Code F20.5 Retained Sub-entries see also Retention cholelithiasis following cholecystectomy
K91.86 foreign body fragments (type of)
Z18.9 animal quill (s) or spines
Z18.31 development, developmental, specific see Disorder, developmental
endochondral bone growth see Disorder, bone, development or growth
Retching Cross-ref See: Vomiting Retention Sub-entries see also Retained bladder see Retention, urine
cholelithiasis following cholecystectomy
K91.86 cyst see Cyst
Reticular erythematous mucinosis Code L98.5 Reticulation, dust Cross-ref See: Pneumoconiosis
Reticulocytosis Code R70.1 Reticuloendotheliosis Sub-entries
leukemic
C91.4 Non-billable Reticulohistiocytoma (giant-cell) Code D76.3 Reticuloid, actinic Code L57.1 hemophagocytic, familial
D76.1 histiocytic medullary
C96.A Retina, retinal Sub-entries see also condition
Retinitis Sub-entries see also Inflammation, chorioretinal diabetic see Diabetes, retinitis
disciformis see Degeneration, macula
focal see Inflammation, chorioretinal, focal
Retinoblastoma Sub-entries C69.2 Non-billable differentiated
C69.2 Non-billable undifferentiated
C69.2 Non-billable Retinochoroiditis Sub-entries see also Inflammation, chorioretinal
disseminated see Inflammation, chorioretinal, disseminated
focal see Inflammation, chorioretinal
juxtapapillaris see Inflammation, chorioretinal, focal, juxtapapillary
central serous see Chorioretinopathy, central serous
Retinoschisis Sub-entries H33.10 Non-billable specified type NEC
H33.19 Non-billable Retortamoniasis Code A07.8 Retractile testis Code Q55.22 cervix see Retroversion, uterus
drum (membrane) see Disorder, tympanic membrane, specified NEC
finger see Deformity, finger
Retrobulbar Cross-ref See: condition Retrocecal Cross-ref See: condition Retrocession Cross-ref See: Retroversion
Retrodisplacement Cross-ref See: Retroversion
Retroflection, retroflexion Cross-ref See: Retroversion
Retrognathia, retrognathism (mandibular) (maxillary) Code M26.19 Retrograde menstruation Code N92.5 Retroperineal Cross-ref See: condition Retroperitoneal Cross-ref See: condition Retroperitonitis Code K68.9 Retropharyngeal Cross-ref See: condition Retroplacental Cross-ref See: condition Retroposition Cross-ref See: Retroversion
Retroprosthetic membrane Code T85.398 Non-billable Retrosternal thyroid (congenital) Code Q89.2 cervix see Retroversion, uterus
female NEC see Retroversion, uterus
human
immunodeficiency, type 2 (HIV 2)
B97.35 T-cell lymphotropic
Retrusion, premaxilla (developmental) Code M26.09 Rett's disease or syndrome Code F84.2 Reverse peristalsis Code R19.2 Reye's syndrome Code G93.7 hemolytic disease (newborn)
P55.0 incompatibility, immunization or sensitization
affecting management of pregnancy NEC
O36.09 Non-billable anti-D antibody
O36.01 Non-billable Rhabdomyolysis (idiopathic) NEC Sub-entries M62.82 traumatic
T79.6 Non-billable Rhabdomyoma Sub-entries see also Neoplasm, connective tissue, benign
adult see Neoplasm, connective tissue, benign
fetal see Neoplasm, connective tissue, benign
glycogenic see Neoplasm, connective tissue, benign
Rhabdomyosarcoma (any type) Cross-ref See: Neoplasm, connective tissue, malignant
Rhabdosarcoma Cross-ref See: Rhabdomyosarcoma
Rhesus (factor) incompatibility Cross-ref See: Rh, incompatibility
adherent pericardium
I09.2 degeneration, myocardium
I09.0 gout see Arthritis, rheumatoid
intercostal, meaning Tietze's disease
M94.0 Rheumatoid Sub-entries see also condition arthritis see also Arthritis, rheumatoid
with involvement of organs NEC
M05.60 with
sore throat see Nasopharyngitis
Rhinoantritis (chronic) Cross-ref See: Sinusitis, maxillary
Rhinodacryolith Cross-ref See: Dacryolith
Rhinolith (nasal sinus) Code J34.89 Rhinopharyngitis (acute) (subacute) Sub-entries see also Nasopharyngitis
destructive ulcerating
A66.5 Rhinosalpingitis Cross-ref See: Salpingitis, eustachian
Rhinosinusitis Cross-ref See: Sinusitis
Rhinosporidiosis Code B48.1 Rhinovirus infection NEC Code B34.8 Rhizomelic chondrodysplasia punctata Code E71.540 atrioventricular nodal
I49.8 Rhytidosis facialis Code L98.8 Rib Sub-entries see also condition
Riboflavin deficiency Code E53.0 Rice bodies Sub-entries see also Loose, body, joint
Richter syndrome Cross-ref See: Leukemia, chronic lymphocytic, B-cell type
Richter's hernia Cross-ref See: Hernia, abdomen, with obstruction
Ricinism Cross-ref See: Poisoning, food, noxious, plant
adult see Osteomalacia
hypophosphatemic with nephrotic-glycosuric dwarfism
E72.09 Rickettsia 364D/R. philipii (Pacific Coast tick fever) Code A77.8 Rickettsial disease Sub-entries A79.9 Rickettsialpox (Rickettsia akari) Code A79.1 due to
Rickettsia akari (rickettsialpox)
A79.1 Ridge, alveolus Sub-entries see also condition
Ridged ear, congenital Code Q17.3 Riedel's Sub-entries
struma, thyroiditis or disease
E06.5 Rieger anomaly or syndrome Code Q13.81 Riehl's melanosis Code L81.4 Rietti-Greppi-Micheli anemia Code D56.9 Rieux's hernia Cross-ref See: Hernia, abdomen, specified site NEC
Riga (-Fede) disease Code K14.0 Riggs' disease Cross-ref See: Periodontitis
Right aortic arch Code Q25.47 Right middle lobe syndrome Code J98.11 Rigid, rigidity Sub-entries see also condition with severe abdominal pain
R10.0 Riley-Day syndrome Code G90.1 RIND (reversible ischemic neurologic deficit) Code I63.9 contraction, complicating delivery
O62.4 esophageal, lower (muscular)
K22.2 Ringed hair (congenital) Code Q84.1 Rise, venous pressure Code I87.8 Rising, PSA following treatment for malignant neoplasm of prostate Code R97.21 Rivalry, sibling Code Z62.891 Rivalta's disease Code A42.2 River blindness Code B73.01 Robert's pelvis Sub-entries Q74.2 with disproportion (fetopelvic)
O33.0 causing obstructed labor
O65.0 Robin (-Pierre) syndrome Code Q87.0 Robinow-Silverman-Smith syndrome Code Q87.19 Robinson's (hidrotic) ectodermal dysplasia or syndrome Code Q82.4 Robles' disease Code B73.01 Rocky Mountain (spotted) fever Code A77.0 Roetheln Cross-ref See: Rubella
Roger's disease Code Q21.0 Rokitansky-Aschoff sinuses (gallbladder) Code K82.8 Rolando's fracture (displaced) Sub-entries S62.22 Non-billable nondisplaced
S62.22 Non-billable Romano-Ward (prolonged QT interval) syndrome Code I45.81 Romberg's disease or syndrome Code G51.8 Roof, mouth Cross-ref See: condition Rosary, rachitic Code E55.0 Rose Sub-entries
Rosenbach's erysipeloid Code A26.0 Rosenthal's disease or syndrome Code D68.1 due to human herpesvirus 6
B08.21 due to human herpesvirus 7
B08.22 Ross River disease or fever Code B33.1 Rossbach's disease Sub-entries K31.89 Rostan's asthma (cardiac) Cross-ref See: Failure, ventricular, left
anomalous, incomplete or insufficient, intestine
Q43.3 spine, incomplete or insufficient see Dorsopathy, deforming, specified NEC
Rotes Quérol disease or syndrome Cross-ref See: Hyperostosis, ankylosing
Roth (-Bernhardt) disease or syndrome Cross-ref See: Meralgia paraesthetica
Rothmund (-Thomson) syndrome Code Q82.8 Rotor's disease or syndrome Code E80.6 Round Sub-entries
back (with wedging of vertebrae) see Kyphosis
sequelae (late effect) of rickets
E64.3 worms (large) (infestation) NEC
B82.0 Ascariasis
B77.9 see also Ascariasis Roussy-Lévy syndrome Code G60.0 Rubeola (meaning measles) Sub-entries see Measles
meaning rubella see Rubella
Rubeosis, iris Cross-ref See: Disorder, iris, vascular
Rubinstein-Taybi syndrome Code Q87.2 Rudimentary (congenital) Sub-entries see also Agenesis arm see Defect, reduction, upper limb
Ruled out condition Cross-ref See: Observation, suspected
disorder of infancy or childhood (in remission)
F98.21 in adults (in remission)
F50.84 Runaway [from current living environment] Code Z62.892 Runeberg's disease Code D51.0 Running out of money Code Z59.868 Rupia (syphilitic) Sub-entries A51.39 abscess (spontaneous) - code by site under Abscess
aneurysm see Aneurysm
anus (sphincter) see Laceration, anus
Russell-Silver syndrome Code Q87.19 Russian spring-summer type encephalitis Code A84.0 Rust's disease (tuberculous cervical spondylitis) Code A18.01 Ruvalcaba-Myhre-Smith syndrome Code E71.440 Rytand-Lipsitch syndrome Code I44.2 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.
