2027 ICD-10-CM Diagnosis Code R29.2Abnormal reflex
ICD-10-CM Codes›R00–R99›R25-R29›R29
- Billable — Valid for Submission
- Not Chronic
R29.2 is a billable ICD-10-CM diagnosis code for abnormal reflex. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 91 through 93. 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
Code Classification
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
- Holmes Adie syndrome
- 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
- Light near dissociated pupil
- 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
- Tonic pupillary reaction
- 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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to R29.2: its own notes plus those printed at Chapter 18. A note printed at a category, block or chapter applies to every code under it.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Notes
General instructions on how these codes are used.
- This chapter includes symptoms, signs, abnormal results of clinical or other investigative procedures, and ill-defined conditions regarding which no diagnosis classifiable elsewhere is recorded.
- Signs and symptoms that point rather definitely to a given diagnosis have been assigned to a category in other chapters of the classification. In general, categories in this chapter include the less well-defined conditions and symptoms that, without the necessary study of the case to establish a final diagnosis, point perhaps equally to two or more diseases or to two or more systems of the body. Practically all categories in the chapter could be designated 'not otherwise specified', 'unknown etiology' or 'transient'. The Alphabetical Index should be consulted to determine which symptoms and signs are to be allocated here and which to other chapters. The residual subcategories, numbered .8, are generally provided for other relevant symptoms that cannot be allocated elsewhere in the classification.
- The conditions and signs or symptoms included in categories R00-R94 consist of:
- (a) cases for which no more specific diagnosis can be made even after all the facts bearing on the case have been investigated;
- (b) signs or symptoms existing at the time of initial encounter that proved to be transient and whose causes could not be determined;
- (c) provisional diagnosis in a patient who failed to return for further investigation or care;
- (d) cases referred elsewhere for investigation or treatment before the diagnosis was made;
- (e) cases in which a more precise diagnosis was not available for any other reason;
- (f) certain symptoms, for which supplementary information is provided, that represent important problems in medical care in their own right.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Abnormal, abnormality, abnormalities See Also: Anomaly;
knee jerk R29.2
plantar reflex R29.2
Areflexia R29.2
Disorder (of) See Also: Disease;
reflex R29.2
Disturbance (s) See Also: Disease;
Hyper-reflexia R29.2
Hyporeflexia R29.2
sucking reflex (newborn) R29.2
Reflex R29.2
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Reflex, Abnormal
an abnormal response to a stimulus applied to the sensory components of the nervous system. this may take the form of increased, decreased, or absent reflexes.
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.
Code HistoryHistory
Questions About R29.2Overview
What is the ICD-10 code for abnormal reflex?
The ICD-10-CM code for abnormal reflex is R29.2 (sometimes written as R292). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
What MS-DRG does R29.2 group to?
When abnormal reflex is the principal diagnosis on an inpatient stay, it groups to MS-DRG 91, 92, 93, with relative weights from 0.7783 to 1.7050 depending on complications. Higher weights mean higher Medicare reimbursement.
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.
