Crystal's MCW Coder Hub🧠 ICD-10-CM R25.1 — Tremor, Unspecified
Billable Code Confirmed
ICD-10-CM R25.1 is a valid, billable 4-character ICD-10-CM code for FY2026. The code is fully specified at the 4-character level:
R25(abnormal involuntary movements category) +.1(tremor, unspecified). No additional characters are required or available.
Non-Billable Parent Code — Never Submit This
- ❌
R25— 3-character category header — non-billable; never submit aloneAlways submit R25.1 (all 4 characters) when tremor is documented as the presenting finding and the specific tremor type or underlying movement disorder has not been established.
Symptom Code — Use Only When No Definitive Diagnosis Exists
R25.1 is a Chapter 18 symptom code. Per ICD-10-CM Official Coding Guidelines, symptom codes should not be reported when a definitive condition that fully explains the symptom has been established and documented. If the physician documents essential tremor (G25.0), Parkinson disease (G20), drug-induced tremor (G25.1), or any specific movement disorder under G20-G26 — assign the specific condition and do not additionally code R25.1. The Excludes 1 at the R25 category level is a hard rule.
Code Classification
ICD-10-CM Diagnosis Code — Fields for wRVU, assistant payable, and global period are not applicable. This is a symptom/sign code used when a definitive neurological diagnosis for the tremor has not yet been established at the time of the encounter or at discharge.
🔍 Code Description
ICD-10-CM R25.1 classifies tremor, unspecified — an involuntary, rhythmic oscillating movement of a body part for which the specific tremor type or underlying neurological cause has not been determined. This is a symptom-level code, capturing the clinical finding in its unresolved state while the diagnostic workup is initiated or completed.
Tremor broadly describes rhythmic, involuntary muscle contractions that produce oscillating movements. Clinically, tremors are classified by their relationship to motor activity (rest tremor vs. action tremor), their body distribution, and their frequency and amplitude. R25.1 applies specifically when these characteristics have been observed but the clinician has not yet determined the tremor subtype or underlying etiology — placing it firmly in the diagnostic gap between symptom observation and confirmed diagnosis.
The most critical distinction with R25.1 is that it is a transitional code — it is appropriate at the first encounter, during an inconclusive workup, or at inpatient discharge when the cause was not established after study. It is not appropriate once a specific movement disorder is confirmed. G25.0 (essential tremor), G20 (Parkinson disease resting tremor), and G25.1 (drug-induced tremor) are all Excludes 1 — they replace R25.1 the moment the diagnosis is made.
🌳 Code Tree / Hierarchy
R25 — Abnormal Involuntary Movements ❌ Non-billable
│
├── R25.0 — Abnormal Head Movements ✅ Billable — see [[R25.0]] note
├── R25.1 — Tremor, Unspecified ◀ THIS CODE ✅ Billable
├── R25.2 — Cramp and Spasm ✅ Billable
├── R25.3 — Fasciculation ✅ Billable
├── R25.8 — Other Abnormal Involuntary Movements ✅ Billable
└── R25.9 — Unspecified Abnormal Involuntary Movements ⚠️ Avoid — query specificity
R25.1 vs. R25.0 — Choose the Right Symptom Code
R25.1 captures tremor — rhythmic, oscillatory involuntary movement affecting any body part. R25.0 captures abnormal head movements specifically. When a tremor is isolated to the head and documented as a head movement abnormality without characterization as “tremor,” R25.0 may be more appropriate. When the physician documents “tremor” — whether upper extremity, generalized, or unspecified location — R25.1 is the correct code pending specificity.
✅ Includes
The following clinical findings and documentation patterns map to R25.1 when no specific tremor type or movement disorder has been diagnosed:
- Tremor NOS — documented by examiner, type unspecified
- Involuntary rhythmic shaking of the upper extremities, etiology undetermined
- Bilateral or unilateral hand tremor, specific type not yet characterized
- Tremor of unspecified body part, workup pending
- Resting vs. action tremor not yet differentiated at this encounter
- Tremor in context of polypharmacy workup not yet attributed to a specific drug or movement disorder
❌ Excludes
Excludes 1 — Cannot Be Coded Simultaneously with R25.1
| Code | Description | Note |
|---|---|---|
| G20 | Parkinson disease | Resting tremor in Parkinson disease → assign G20, not R25.1 |
| G25.0 | Essential tremor | Essential tremor confirmed → assign G25.0, not R25.1 |
| G25.1 | Drug-induced tremor | Drug-induced tremor → assign G25.1 + external cause code, not R25.1 |
| G25.2 | Other specified forms of tremor | Intention tremor, postural tremor (other specified) → assign G25.2, not R25.1 |
| G20-G26 | All specific movement disorders | Entire range is Excludes 1 — once any specific movement disorder is diagnosed, R25.1 is excluded |
| F98.4 | Stereotyped movement disorders | Behavioral/psychiatric etiology — mutually exclusive |
| F95.- | Tic disorders | Tic disorder NOS, Tourette’s — mutually exclusive; assign F95.x, not R25.1 |
Excludes 1 — G20-G26 Is a Hard, Category-Level Exclusion
The entire G20-G26 range (specific movement disorders) carries an Excludes 1 instruction at the R25 category level. This applies to every code within R25, including R25.1. If any specific movement disorder is documented and confirmed, R25.1 cannot be coded simultaneously. This is among the highest-frequency Excludes 1 violation risks in neurology inpatient coding — particularly with Parkinson disease (G20) and essential tremor (G25.0), which are commonly treated on the same unit.
📋 Clinical Overview
R25.1 vs. Specific Tremor Codes — The Critical Distinction
This distinction must come entirely from physician documentation — coders cannot classify tremor type from exam descriptions alone. The line between R25.1 and G25.0 or G20 is a physician determination that often requires neurological examination, medication history review, and imaging.
| Feature | R25.1 — Symptom Code | G25.0 — Essential Tremor | G20 — Parkinson Disease |
|---|---|---|---|
| Diagnostic certainty | Undetermined | Action/postural tremor confirmed | Resting tremor + bradykinesia + rigidity |
| Tremor type | Uncharacterized | Bilateral action tremor, head/voice involvement | Unilateral or bilateral resting “pill-rolling” |
| HCC contribution | ❌ None | Review HCC mapping | ✅ HCC-mapped — significant RAF |
| Duration of use | Temporary — initial/inconclusive encounters | Long-term diagnosis | Long-term diagnosis |
| CDI opportunity | ✅ High — query at every inpatient encounter | N/A | N/A |
CDI Query Trigger — Every R25.1 on a Completed Inpatient Record
R25.1 on a completed inpatient record without a documented upgrade attempt is a CDI gap. Parkinson disease (G20) in particular is a high-RAF, high-priority CDI target — a patient admitted with “tremor” who is already on carbidopa-levodopa or who has documented bradykinesia and rigidity has an established diagnosis that should be captured as G20, not obscured behind R25.1.
Pathophysiology
Tremor is an involuntary, rhythmic, oscillatory movement produced by alternating or synchronous contractions of opposing muscle groups. The underlying mechanism varies by tremor type: Parkinson disease produces resting tremor through dopaminergic pathway degeneration in the substantia nigra, affecting the basal ganglia motor circuit; essential tremor involves abnormal oscillatory activity in the cerebello-thalamo-cortical loop; drug-induced tremor results from dopamine receptor blockade (as with antipsychotics) or enhancement of beta-adrenergic activity (as with bronchodilators or stimulants).
At the symptom-code stage captured by R25.1, the precise neurological mechanism has not been determined. Clinical characterization — distinguishing rest tremor from action tremor, assessing frequency and amplitude, identifying associated findings (bradykinesia, rigidity, ataxia) — is the clinical process that ultimately yields the specific diagnosis that replaces R25.1. The code exists precisely at this diagnostic decision point.
Tremor Classification and Upgrade Targets
| Tremor Type | Key Features | Upgrade Code |
|---|---|---|
| Resting tremor | Present at rest, suppressed with movement; pill-rolling; unilateral onset | G20 Parkinson disease |
| Essential (action/postural) tremor | Bilateral, worsens with action/posture, head/voice involvement; family history | G25.0 Essential tremor |
| Drug-induced tremor | Recent medication change; dopamine blocker, lithium, valproate, bronchodilator | G25.1 Drug-induced tremor |
| Intention tremor | Worsens at end of goal-directed movement; cerebellar signs | G25.2 Other specified tremor |
| Orthostatic tremor | High-frequency leg tremor upon standing | G25.2 Other specified tremor |
| Physiologic / enhanced physiologic | Anxiety, caffeine, thyroid, metabolic | Underlying cause code; R25.1 may persist if no specific disorder |
| Psychogenic/functional | Inconsistent, distractible, entrainable | F44.4 Conversion disorder with movement disorder |
| Idiopathic — unclassifiable after workup | No specific type identified | R25.1 remains as appropriate code |
Sequencing Principle — When Cause Is Identified
When the underlying condition causing tremor is identified and documented code the underlying condition — G20, G25.0, G25.1, G35, etc. — as principal or the relevant diagnosis. R25.1 is excluded by the Excludes 1 instruction once a specific movement disorder in the G20-G26 range is confirmed. Do not code both.
Clinical Presentation
Patients presenting with tremor documented under R25.1 typically exhibit:
- Involuntary rhythmic shaking of the upper extremities, head, voice, trunk, or lower extremities — body part not yet characterizing the tremor subtype
- Rest tremor (present when limb is supported, suppressed with movement) vs. action tremor (present with or worsened by voluntary movement) — distinction under evaluation
- Frequency and amplitude — coarse (low-frequency) vs. fine (high-frequency) tremor; amplitude variable
- Functional impact — difficulty with writing, eating, drinking, fine motor tasks — severity assessed
- Associated findings under evaluation: bradykinesia, cogwheel rigidity, postural instability, gait disturbance, ataxia, cognitive changes
Documentation Requirements
For accurate assignment of R25.1, physician documentation should include:
- Observable finding — explicit documentation that tremor was observed on examination; not just patient self-report without clinical confirmation
- Tremor characterization — rest vs. action, body parts affected, unilateral vs. bilateral, frequency/amplitude if documented
- Negative or inconclusive workup — explicit statement that specific tremor type or movement disorder has NOT been established
- Differential diagnostic intent — workup is pending or ongoing; supports continued use of symptom code
- Exclusion of specific disorders documented — “not consistent with essential tremor,” “Parkinson disease not confirmed” — this language protects the symptom code assignment
- Etiology if identified — if the cause is determined, the specific G20-G26 code replaces R25.1 immediately
💰 HCC Risk Adjustment (CMS-HCC v28)
| Field | Detail |
|---|---|
| CMS-HCC Model Version | v28 (2024-2025 Implementation) |
| HCC Assignment | ❌ Not Mapped |
| HCC Category | N/A |
| RAF Coefficient | 0.000 |
| RxHCC Assignment | Not Mapped |
R25.1 does not map to an HCC under CMS-HCC v28 and does not contribute to a patient’s Risk Adjustment Factor (RAF) score.
R25.1 — The Single Most RAF-Significant CDI Target in Neurology
R25.1 sitting on a completed inpatient record is one of the highest yield CDI review targets in the neurological coding space. Parkinson disease (G20) carries one of the highest individual RAF coefficients in CMS-HCC v28. A patient admitted with documented tremor, already on sinemet, with known Parkinson’s in the medication list but physician documentation that says only “tremor” is a missed HCC of significant magnitude. Review and ensure complete coding of:
- Parkinson disease (G20) — HCC-mapped, very high RAF
- Multiple sclerosis (G35) — HCC-mapped
- Hemiplegia/hemiparesis (G81.x) — HCC-mapped
- Diabetes with neurological complications — HCC 18/19 series
The medication reconciliation list is your CDI cheat sheet — carbidopa-levodopa → query G20; propranolol for tremor → query G25.0; antipsychotic + new tremor → query G25.1.
🏥 MS-DRG Assignment
MDC 01 — Diseases and Disorders of the Nervous System
| DRG | Title | Est. Relative Weight* |
|---|---|---|
| DRG 091 | Other Disorders of Nervous System with MCC | ~1.40-1.80 |
| DRG 092 | Other Disorders of Nervous System with CC | ~0.90-1.20 |
| DRG 093 | Other Disorders of Nervous System without CC/MCC | ~0.65-0.85 |
*Approximate. Verify against IPPS FY2026 Final Rule tables.
Symptom Code as Principal Diagnosis — Guidelines Restriction
Per ICD-10-CM Official Coding Guidelines Section II, symptom codes from Chapter 18 may serve as principal diagnosis only when no confirmed underlying condition was established after study during the admission. If the inpatient workup identifies a specific movement disorder, that specific condition sequences as principal — not R25.1. A symptom code as principal in a completed inpatient record where the etiology was established is a sequencing error and an audit risk.
🔗 Related ICD-10-CM Codes
R25 Category Sibling Codes
| Code | Description |
|---|---|
| R25.0 | Abnormal head movements — see separate note |
| R25.1 | Tremor, unspecified ← This Code |
| R25.2 | Cramp and spasm |
| R25.3 | Fasciculation |
| R25.8 | Other abnormal involuntary movements |
| R25.9 | Unspecified abnormal involuntary movements ⚠️ Avoid — query specificity |
Upgrade Target Codes (Specific Movement Disorders — Excludes 1)
| Code | Description | When to Upgrade |
|---|---|---|
| G20 | Parkinson disease | Resting tremor + bradykinesia + rigidity — confirmed diagnosis; replaces R25.1 |
| G25.0 | Essential tremor | Bilateral action/postural tremor confirmed — replaces R25.1 |
| G25.1 | Drug-induced tremor | Medication-related tremor confirmed — replaces R25.1; add external cause code |
| G25.2 | Other specified forms of tremor | Intention tremor, orthostatic tremor — replaces R25.1 |
| G35.- | Multiple sclerosis | Tremor in context of confirmed MS — code MS as principal/relevant diagnosis |
| F44.4 | Conversion disorder with movement disorder | Psychogenic/functional tremor — replaces R25.1 when confirmed |
| E05.90 | Hyperthyroidism, unspecified | Metabolic cause of tremor — code additionally; R25.1 may or may not persist depending on clinical intent |
Associated Comorbidity Codes
| Code | Description | Coding Relevance |
|---|---|---|
| G20 | Parkinson disease | Most RAF-significant upgrade from R25.1; medication reconciliation clue: carbidopa-levodopa on med list |
| G25.0 | Essential tremor | Second most common upgrade; medication clue: propranolol, primidone prescribed for tremor |
| G25.1 | Drug-induced tremor | Medication reconciliation review — antipsychotics, lithium, valproate, amiodarone, stimulants |
| R26.0 | Ataxic gait | May coexist when tremor and cerebellar signs are present; codeable additionally |
| F32.x | Depressive disorder | Depression frequently coexists with Parkinson disease and essential tremor — code additionally when documented |
| Z87.39 | Personal history of other diseases of the nervous system | History context for recurrent neurological presentations |
🛠️ Commonly Associated CPT Codes
Outpatient and Physician Setting Context
The CPT codes below are associated with the diagnostic evaluation and management of tremor in outpatient, neurology, and ED settings. In the inpatient setting, ICD-10-PCS procedure codes govern procedural reporting.
| CPT Code | Description | Clinical Application |
|---|---|---|
| 99205 | Office or other outpatient visit, new patient, high complexity | Initial neurology or primary care evaluation of new tremor |
| 99215 | Office or other outpatient visit, established patient, high complexity | Complex tremor follow-up with management and diagnostic interpretation |
| 95885 | Needle EMG, each extremity or truncal muscle; limited | Electromyographic assessment when distinguishing tremor subtypes or ruling out myoclonus |
| 95886 | Needle EMG, each extremity; complete study | Full EMG for comprehensive movement disorder workup |
| 95907 | Nerve conduction studies; 1-2 studies | Peripheral neuropathy evaluation if neuropathic tremor is in differential |
| 70553 | MRI brain with and without contrast | Structural workup for cerebellar, basal ganglia, or demyelinating pathology |
| 78607 | Brain imaging, tomographic (SPECT) | DaTscan — dopamine transporter imaging to distinguish Parkinson disease from essential tremor |
| 96116 | Neurobehavioral status exam, first hour | Cognitive assessment when Parkinson disease with dementia or Lewy body dementia is in differential |
| 64614 | Chemodenervation of muscle(s); extremity and/or trunk muscle(s) | Botulinum toxin injection for confirmed essential tremor affecting upper extremities |
NCCI Bundling Considerations
NCCI PTP Edits — Verify Before Billing
- 95885 or 95886 (EMG) and 95907 (nerve conduction) billed same DOS: review current NCCI PTP edit status — both are commonly performed in the same session but modifier rules and edit status should be verified.
- 78607 (DaTscan SPECT) and E/M same DOS: modifier -25 required on the E/M when the evaluation is separately documentable beyond the pre/post procedure service.
- 64614 (chemodenervation, extremity/trunk) and E/M same DOS: modifier -25 required on the E/M code.
- 70553 (brain MRI) ordered same DOS as E/M: independently billable; ensure separate ordering documentation.
🔬 ICD-10-PCS Crosswalk (Inpatient Procedures)
When R25.1 is an inpatient diagnosis and a procedure is performed as part of the diagnostic workup, the following ICD-10-PCS sections are relevant. Full PCS codes require completion of all seven characters — consult the PCS tables for the applicable fiscal year.
| PCS Section | Body System | Root Operation | Clinical Application |
|---|---|---|---|
| B (Imaging) | 0 (Central Nervous System) | 3 (MRI) | Brain MRI (B030ZZZ) — basal ganglia, cerebellar, and white matter evaluation for tremor workup |
| C (Nuclear Medicine) | 0 (Central Nervous System) | 1 (Planar Nuclear Medicine Imaging) | DaTscan SPECT — dopamine transporter imaging, inpatient |
| 4 (Measurement & Monitoring) | A (Physiological Systems) | 0 (Measurement) | Neurological function assessment — motor evoked potentials, EEG |
| 3 (Administration) | E (Physiological Systems) | 0 (Introduction) | Intramuscular botulinum toxin injection (chemodenervation) when administered inpatient |
💊 Coding Scenarios and Examples
Scenario 1 — New Bilateral Hand Tremor, Workup Initiated (Outpatient Neurology — First Visit)
Clinical Vignette: A 72-year-old male is referred to neurology by his primary care physician for a 6-month history of bilateral hand shaking. Exam reveals bilateral postural and action tremor, upper extremities, mild amplitude. No bradykinesia, no rigidity noted. Physician documents: “Bilateral hand tremor — differential includes essential tremor vs. early Parkinson disease. DaTscan ordered. No specific movement disorder established at this time.” The specific diagnosis is not made at this encounter.
CPT Codes (Outpatient Neurology):
- 99205 — New patient office visit, high complexity
- 78607 — Brain SPECT (DaTscan) (ordered at this encounter)
ICD-10-CM:
- R25.1 — Tremor, unspecified (no specific disorder established — symptom code is correct for this encounter)
R25.1 Is Correct Here — Diagnosis Not Yet Established
Scenario 2 — Tremor, Essential Tremor Confirmed Same Encounter (Outpatient)
Clinical Vignette: A 65-year-old female with a strong family history of hand shaking presents to neurology. Exam confirms bilateral postural and kinetic hand tremor with mild head tremor, no resting component, no bradykinesia. Physician documents: “Essential tremor confirmed — bilateral, upper extremity and head. Starting propranolol.”
CPT Codes:
- 99213 — Established patient office visit, low-moderate complexity
ICD-10-CM:
- G25.0 — Essential tremor (specific diagnosis confirmed — R25.1 is NOT coded per Excludes 1; G25.0 replaces it entirely)
Do Not Assign R25.1 When Specific Diagnosis Is Confirmed
Scenario 3 — Drug-Induced Tremor, Antipsychotic-Related (Outpatient)
Clinical Vignette: A 38-year-old male on risperidone for bipolar disorder presents with new-onset bilateral hand tremor over 4 weeks. Neurological exam: bilateral resting and postural tremor, upper extremities. No other movement disorder features. Psychiatrist documents: “Drug-induced tremor, risperidone-related.”
CPT Codes:
- 99214 — Established patient office visit, moderate complexity
ICD-10-CM:
- G25.1 — Drug-induced tremor (specific — replaces R25.1 per Excludes 1)
- T43.595A — Adverse effect of other antipsychotics and neuroleptics, initial encounter (required adverse effect code — identifies the causative agent)
- F31.9 — Bipolar disorder, unspecified (underlying psychiatric condition)
Drug-Induced Tremor Always Requires the Adverse Effect Code
Scenario 4 — Tremor, Parkinson Disease Identified During Inpatient Admission
Clinical Vignette: A 78-year-old male is admitted for a fall. History review reveals a 2-year history of tremor managed with carbidopa-levodopa. Neurology consult documents: “Parkinson disease with resting tremor — well-established diagnosis, currently on carbidopa-levodopa. Fall related to Parkinson gait instability.”
Principal Diagnosis:
- W19.XXXA — Unspecified fall, initial encounter (mechanism of admission — or Z87.39 depending on coding conventions at facility)
- Alternatively, if admission is primarily for evaluation of Parkinson management: G20 — Parkinson disease sequences as principal
Additional Diagnoses:
- G20 — Parkinson disease (confirmed, documented — R25.1 is NOT appropriate; G20 captures the tremor diagnosis specifically)
G20 Always Replaces R25.1 — Never Code Both
Scenario 5 — Tremor, Inpatient Workup Negative (Idiopathic — Symptom Code Remains)
Clinical Vignette: A 82-year-old female is admitted with new-onset bilateral upper extremity tremor. Comprehensive workup completed: brain MRI normal, DaTscan normal, thyroid studies normal, metabolic panel normal, medication review — no offending agents. Neurology concludes: “Tremor, etiology undetermined — not consistent with Parkinson disease or essential tremor. Outpatient follow-up arranged.”
Principal Diagnosis:
- R25.1 — Tremor, unspecified (workup completed — no definitive etiology established; symptom code remains as principal per Official Coding Guidelines Section II.A)
MS-DRG Assignment:
- DRG 093 — Other Disorders of Nervous System without CC/MCC (if no qualifying CCs/MCCs documented)
- DRG 092 — with CC; DRG 091 — with MCC
Symptom Code as Discharge Principal — Acceptable When Workup Is Exhaustive and Negative
The inpatient workup was thorough and yielded no definitive diagnosis. R25.1 correctly sequences as principal. The coding record should reflect that workup was completed without definitive etiology to support the symptom-as-principal assignment under audit.
⚠️ Coding Pitfalls and Tips
| Pitfall or Tip | |
|---|---|
| ❌ | Do not assign R25.1 when a specific movement disorder (G20-G26) is documented — Excludes 1 is a hard rule; the specific diagnosis replaces R25.1 entirely |
| ❌ | Do not code R25.1 with G20 — Parkinson disease tremor is captured in G20; coding both is an Excludes 1 violation |
| ❌ | Do not code R25.1 with G25.0 or G25.1 — all specific tremor codes within G20-G26 are Excludes 1 |
| ❌ | Do not allow R25.1 to persist as principal in a completed inpatient record when the workup established a specific diagnosis |
| ❌ | Do not assign G25.1 without the adverse effect T-code — drug-induced tremor always requires identification of the causative medication |
| ✅ | R25.1 is appropriate only in the diagnostic gap — first encounter, pending workup, or exhaustive workup without definitive etiology |
| ✅ | Medication reconciliation is your CDI tool — carbidopa-levodopa on the med list = query G20; propranolol for tremor = query G25.0; antipsychotic + new tremor = query G25.1 |
| ✅ | Every R25.1 on a completed inpatient record is a CDI query target — Parkinson disease (G20) is one of the highest-RAF diagnoses in CMS-HCC v28 |
| ✅ | Upgrade from R25.1 to G20 is the highest-value single-code CDI swap in neurology inpatient coding — prioritize this review at every encounter |
| ✅ | Document why specific diagnosis cannot be established — protects the symptom code assignment if workup is genuinely inconclusive and supports the coding record under audit |
📚 Sources
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CMS/NCHS. ICD-10-CM Official Guidelines for Coding and Reporting, FY2026. Tabular List — R25.1; R25 category Excludes 1 notations; Chapter 18 symptom code guidelines Sections II, IV.
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AMA. CPT Professional Edition 2026. Neurology and Neuromuscular Procedures subsection (95800-96020); Radiology — Nuclear Medicine; Evaluation and Management guidelines.
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Pabau. “ICD-10-CM Tremor Codes: R25.1, G25.0, G25.1, G25.2.” Published March 2026. Clinical distinctions between tremor code assignments.
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CMS. 2025-2026 Medicare Advantage Risk Adjustment — CMS-HCC Model v28 ICD-10-CM Mappings. Baltimore, MD: Centers for Medicare & Medicaid Services.
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CMS. IPPS Final Rule FY2026 — MS-DRG Definitions Manual v43. MDC 01 logic tables — Other Disorders of Nervous System DRG grouping.
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CMS. ICD-10-PCS Reference Manual FY2026. Section B (Imaging), Body System 0 (Central Nervous System); Section C (Nuclear Medicine).
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CMS. NCCI Policy Manual for Medicare Services, current version. Neurology chapter and general correct coding principles.