2026 ICD-10-CM Diagnosis Code R29.2Abnormal reflex

ICD-10-CM Codes›R00–R99›R25-R29›R29

ICD-10-CM R29.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R29.2 is a billable ICD-10-CM diagnosis code for abnormal reflex. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nervous system signs and symptoms.

Code Identity

ICD-10-CM Code
R29.2
Billable Status
Yes — Valid for Submission
Code Describes
Abnormal reflex
Short Description
Abnormal reflex
Same as the full description in the CMS dataset.
Parent Code
R29
Other symptoms and signs involving the nervous and musculoskeletal systems

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR25-R29Symptoms and signs involving the nervous and musculoskeletal systems
CategoryR29Other symptoms and signs involving the nervous and musculoskeletal systems
This CodeR29.2Abnormal reflex

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abdominal reflex absent
  • Abdominal reflex delayed
  • Abdominal reflex finding
  • Abdominal reflex present only with reinforcement
  • Abdominal reflex unequal
  • Abnormal acoustic reflex
  • Abnormal corneal reflex
  • Abnormal postural reflex
  • Abnormal reflex
  • Absence of direct light pupillary reflex
  • Absent palatal reflex
  • Absent plantar response
  • Absent plantar response left
  • Absent plantar response right
  • Absent pupil reaction
  • Absent reflex
  • Absent reflex on one side of body
  • Absent tendon reflex
  • Acoustic reflex finding
  • Anal reflex absent
  • Anal reflex brisk
  • Anal reflex delayed
  • Anal reflex finding
  • Anal reflex present only with reinforcement
  • Ankle reflex absent
  • Ankle reflex brisk
  • Ankle reflex delayed
  • Ankle reflex finding
  • Ankle reflex inverted
  • Ankle reflex present only with reinforcement
  • Ankle reflex, slow recovery phase
  • Ankle reflexes unequal
  • Asymmetrical Moro reflex
  • Asymmetrical tonic neck reflex finding
  • Auropalpebral reflex absent
  • Auropalpebral reflex finding
  • Biceps reflex absent
  • Biceps reflex brisk
  • Biceps reflex delayed
  • Biceps reflex finding
  • Biceps reflex inverted
  • Biceps reflex present only with reinforcement
  • Biceps reflexes unequal
  • Bilateral absent plantar response
  • Bilateral equivocal plantar response
  • Bilateral extensor plantar response
  • Blink reflex absent
  • Blink reflex finding
  • Blinking
  • Brisk peripheral reflexes
  • Brisk tendon reflex
  • Brudzinski's sign
  • Bulbocavernosus reflex finding
  • Bulbocavernosus reflex positive
  • Cerebellar ataxia, areflexia, pes cavus, optic atrophy, sensorineural hearing loss syndrome
  • Chaddock's reflex
  • Ciliospinal reflex finding
  • Ciliospinal reflex positive
  • Corneal reflex absent
  • Corneal reflex delayed
  • Corneal reflex finding
  • Cough impulse impaired
  • Cough impulse of mass absent
  • Cough reflex absent
  • Cough reflex finding
  • Cremasteric reflex finding
  • Cremasteric reflex negative
  • Decreased abdominal reflex
  • Decreased Achilles tendon reflex
  • Decreased anal reflex
  • Decreased ankle reflex
  • Decreased biceps reflex
  • Decreased blinking
  • Decreased corneal reflex
  • Decreased cremasteric reflex
  • Decreased finger jerk reflex
  • Decreased flexor reflex
  • Decreased jaw reflex
  • Decreased knee reflex
  • Decreased pupillary reflex
  • Decreased reflex
  • Decreased sacral reflex
  • Decreased stretch reflex
  • Decreased supinator reflex
  • Decreased suprapatellar jerk reflex
  • Decreased tendon reflex
  • Decreased triceps reflex
  • Defecation reflex - spurious diarrhea
  • Defecation reflex abnormal - constipated
  • Defecation reflex finding
  • Deficient blink reflex
  • Early-onset myopathy, areflexia, respiratory distress, dysphagia syndrome
  • Equivocal plantar response
  • Equivocal plantar response left
  • Equivocal plantar response right
  • Exaggeration of ankle reflex
  • Exaggeration of biceps reflex
  • Exaggeration of brachioradialis reflex
  • Exaggeration of jaw reflex
  • Exaggeration of knee reflex
  • Exaggeration of suprapatellar jerk
  • Exaggeration of triceps reflex
  • Extensor plantar response finding
  • Extensor plantar response left
  • Extensor plantar response right
  • Eye cornering in direction of sound - finding
  • Eye cornering in direction of sound absent
  • Eye cornering in direction of sound equivocal
  • Eyelash reflex absent
  • Eyelash reflex finding
  • Finding of cough impulse of lump
  • Finger jerk absent
  • Finger jerk brisk
  • Finger jerk delayed
  • Finger jerk finding
  • Finger jerk inverted
  • Finger jerk present only with reinforcement
  • Fisting reflex absent
  • Fisting reflex equivocal
  • Fisting reflex finding
  • Freezing reflex absent
  • Freezing reflex equivocal
  • Freezing reflex finding
  • Freezing reflex present
  • Galant's reflex absent
  • Galant's reflex equivocal
  • Galant's reflex finding
  • General areflexia
  • Glabella reflex absent
  • Glabella reflex finding
  • Glabella reflex present
  • Hoffman reflex equivocal
  • Hoffman's reflex finding
  • Hoffman's reflex positive
  • Horizontal board test
  • Hyperreflexia
  • Increased flexor reflex
  • Increased stretch reflex
  • Jaw reflex absent
  • Jaw reflex brisk
  • Jaw reflex delayed
  • Jaw reflex finding
  • Kernig's sign
  • Knee reflex absent
  • Knee reflex brisk
  • Knee reflex delayed
  • Knee reflex finding
  • Knee reflex inverted
  • Knee reflex present only with reinforcement
  • Knee reflexes unequal
  • Left corneal reflex absent
  • Mass reflex finding
  • Mass reflex present
  • Moro reflex equivocal
  • Moro reflex finding
  • Moro reflex present
  • Motor response to deep glabella pressure - finding
  • Motor response to deep glabella pressure present
  • Nervous system respiratory control finding
  • Oppenheim's reflex
  • Palmar reflex absent
  • Palmar reflex equivocal
  • Palmar reflex finding
  • Palmomental reflex absent
  • Palmomental reflex equivocal
  • Palmomental reflex finding
  • Parachute reaction absent
  • Parachute reaction equivocal
  • Parachute reaction present
  • Parachute reflex finding
  • Persistent asymmetrical tonic neck reflex
  • Pharyngeal gag reflex finding
  • Pharyngeal gag reflex negative
  • Placing reaction absent
  • Placing reaction equivocal
  • Placing reaction finding
  • Plantar grasp reflex absent
  • Plantar grasp reflex equivocal
  • Plantar grasp reflex finding
  • Positive horizontal board test
  • Primary walking reaction - finding
  • Primary walking reaction absent
  • Primary walking reaction equivocal
  • Progressive spinocerebellar ataxia with decreased tendon reflexes
  • Radial reflex absent
  • Radial reflexes unequal
  • Reflex disturbances due to substance use
  • Right corneal reflex absent
  • Rooting reflex absent
  • Rooting reflex equivocal
  • Rooting reflex finding
  • Sacral reflex absent
  • Sacral reflex brisk
  • Sacral reflex delayed
  • Sacral reflex finding
  • Sacral reflex inverted
  • Sacral reflex present only with reinforcement
  • Slow recovery phase of reflex
  • Slow relaxing peripheral reflexes
  • Snout reflex absent
  • Snout reflex equivocal
  • Snout reflex finding
  • Snout reflex present
  • Stepping reflex absent
  • Stepping reflex equivocal
  • Stepping reflex finding
  • Sucking reflex absent
  • Sucking reflex equivocal
  • Sucking reflex finding
  • Supinator reflex brisk
  • Supinator reflex delayed
  • Supinator reflex finding
  • Supinator reflex inverted
  • Supinator reflex present only with reinforcement
  • Suprapatellar jerk abnormal
  • Suprapatellar jerk absent
  • Suprapatellar jerk reflexes unequal
  • Suprapatellar reflex finding
  • Swallowing reflex absent
  • Swallowing reflex equivocal
  • Swallowing reflex finding
  • Tonic neck reflex absent
  • Tonic neck reflex equivocal
  • Tonic neck reflex finding
  • Triceps reflex absent
  • Triceps reflex brisk
  • Triceps reflex delayed
  • Triceps reflex finding
  • Triceps reflex inverted
  • Triceps reflex present only with reinforcement
  • Triceps reflexes unequal
  • Unequal reflexes
  • Vestibulo-ocular reflex absent
  • Vestibulo-ocular reflex finding

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 2 Excludes

  • abnormal pupillary reflex H57.0
  • hyperactive gag reflex J39.2
  • vasovagal reaction or syncope R55

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Abnormal, abnormality, abnormalities
      • knee jerk
    • Abnormal, abnormality, abnormalities
      • plantar reflex
    • Areflexia
    • Disorder(of)
      • reflex
    • Disturbance(s)
      • motor
    • Disturbance(s)
      • reflex
    • Hyper-reflexia
    • Hyporeflexia
    • Poor
      • sucking reflex (newborn)
    • Reflex

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR SYM010
Nervous system signs and symptoms
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Blinking

    brief closing of the eyelids by involuntary normal periodic closing, as a protective measure, or by voluntary action.

  • Blinking

    voluntary or involuntary rapid closure and opening of the eyelids.

  • Excessive Blinking

    an increased blink rate that affects quality of life.

Patient EducationClinical

Peripheral Nerve Disorders

Nerves are like wires that carry messages back and forth between your brain and your body. Your peripheral nerves branch off from your brain and spinal cord and connect to all parts of your body, including your muscles and organs.

The full article covers:

  • What are peripheral nerves?
  • What are peripheral nerve disorders?
  • What causes peripheral nerve disorders?
  • What are the symptoms of peripheral nerve disorders?
  • How are peripheral nerve disorders diagnosed?
  • What are the treatments for peripheral nerve disorders?
  • Can peripheral nerve disorders be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert R29.2 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
796.1 Abnormal reflex
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About R29.2Overview

Is R29.2 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report abnormal reflex on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can R29.2 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the abnormal reflex is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R29.2?

Under the General Equivalence Mappings, abnormal reflex converts to ICD-9-CM 796.1 (abnormal reflex). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.