Crystal's Coder Hub🧬 ICD-10 CM G52.2 — Disorders of Vagus Nerve
Billable Code Confirmed
ICD-10 CM G52.2 is a valid, billable 5-character ICD-10-CM diagnosis code for FY2026. The first character (G) identifies the nervous system chapter; characters 1-3 (G52) define the category “Disorders of other cranial nerves”; the fourth character (
.2) specifies the vagus nerve as the nerve affected. No additional characters are required — G52.2 is a terminal code and is complete as written.
Non-Billable Parent Code — Never Submit This
- ❌
G52— 3-character header — does not specify which cranial nerve is affectedAlways submit G52.2 (all 5 characters including the decimal) when a disorder of the vagus nerve (CN X) is documented.
Clinical Context: Vagus Nerve vs. Other Cranial Nerve Codes
ICD-10 CM G52.2 is specifically reserved for disorders of the tenth cranial nerve (CN X — vagus nerve). Do not use this code for disorders of the recurrent laryngeal nerve when the vagal origin is not explicitly documented, for acoustic nerve disorders (use H93.3x), or for optic nerve pathology (use H46 or H47.0x). The vagus nerve’s extensive anatomical course — from the brainstem through the neck, thorax, and abdomen — means that vagal disorders present with a wide spectrum of autonomic, laryngeal, pharyngeal, and gastrointestinal manifestations.
Code Classification
ICD-10-CM Diagnosis Code — G52.2 is a diagnosis code only. wRVU values, global periods, and assistant-at-surgery payability are not applicable to ICD-10-CM diagnosis codes. For procedural coding associated with this diagnosis, refer to the CPT Procedural Crosswalk and ICD-10-PCS Crosswalk sections below.
🔍 Code Description
ICD-10 CM G52.2 classifies disorders of the vagus nerve (CN X). This code captures any disease, injury, palsy, or dysfunction of the vagus nerve when the condition is not attributable to an underlying etiology that has a more specific code — it is the correct code when the clinical documentation confirms vagal nerve pathology without directing the coder to a cause-specific code.
The vagus nerve (CN X) is the longest of the cranial nerves, originating in the dorsal motor nucleus of the medulla oblongata and traveling bilaterally through the jugular foramen, carotid sheath, posterior mediastinum, and esophageal hiatus to supply parasympathetic innervation to the heart, lungs, and abdominal viscera. Vagal disorders may disrupt heart rate regulation, gastric motility (leading to gastroparesis), pharyngeal and laryngeal motor function (causing dysphagia and dysphonia), and the afferent limb of several autonomic reflexes.
🌳 Code Tree / Hierarchy
G50-G59 Nerve, nerve root and plexus disorders ❌ Non-billable (block)
│
├── G50 Disorders of trigeminal nerve ❌ Non-billable header
│ ├── G50.0 Trigeminal neuralgia ✅ Billable
│ └── G50.1 Atypical facial pain ✅ Billable
│
├── G51 Facial nerve disorders ❌ Non-billable header
│ ├── G51.0 Bell palsy ✅ Billable
│ └── G51.3x Clonic hemifacial spasm ✅ Billable (with laterality)
│
├── G52 Disorders of other cranial nerves ❌ Non-billable header
│ ├── G52.0 Disorders of olfactory nerve ✅ Billable
│ ├── G52.1 Disorders of glossopharyngeal nerve ✅ Billable
│ ├── G52.2 Disorders of vagus nerve ◀ THIS CODE ✅ Billable
│ ├── G52.3 Disorders of hypoglossal nerve ✅ Billable
│ ├── G52.7 Disorders of multiple cranial nerves ✅ Billable
│ ├── G52.8 Disorders of other specified cranial nerves ✅ Billable
│ └── G52.9 Cranial nerve disorder, unspecified ✅ Billable
│
└── G54 Nerve root and plexus disorders ❌ Non-billable header
Specificity Matters — Don't Default to G52.9
G52.9 (Cranial nerve disorder, unspecified) should never be assigned when the documentation identifies the vagus nerve — G52.9 is reserved for cases where the specific cranial nerve is truly not documented. Submitting G52.9 instead of G52.2 is a specificity failure and may trigger payer requests for medical record documentation or claim denials.
✅ Includes
The following clinical terms and scenarios map to G52.2 when documented:
- Vagal neuropathy (non-diabetic, non-drug-induced)
- Disorder of the tenth cranial nerve (CN X)
- Vagus nerve palsy
- Vagal dysfunction NOS (not otherwise specified)
- Recurrent laryngeal nerve disorder when vagal origin is explicitly documented by the provider
❌ Excludes
Excludes 2 — May Be Coded in Addition if Separately Present
| Code | Description | Note |
|---|---|---|
| H93.3x | Disorders of acoustic (8th) nerve | Code separately if CN VIII pathology co-exists; not mutually exclusive with G52.2 |
| H46 | Optic neuritis | Code separately if optic nerve inflammation is also present |
| H47.0x | Disorders of optic nerve NEC | Code separately if optic nerve disease is also present and documented |
| H49.0-H49.2 | Paralytic strabismus due to nerve palsy | Code separately if cranial nerve palsy causes extraocular muscle imbalance |
Excludes 2 Key Reminder
All entries under G52’s Excludes 2 note are separately codeable conditions — you CAN code G52.2 and one of these codes simultaneously if both conditions are documented and clinically present. The Excludes 2 note means these conditions are NOT included in G52.2, not that they are forbidden.
Note: G52.2 carries no Excludes 1 relationships in the FY2026 ICD-10-CM tabular.
📋 Clinical Overview
Vagal Nerve Disorder vs. Related Cranial Nerve Codes
Understanding the anatomical boundaries of CN X guides accurate code selection among the G52 siblings.
| Feature | G52.2 — Vagus (CN X) | G52.1 — Glossopharyngeal (CN IX) | G52.3 — Hypoglossal (CN XII) |
|---|---|---|---|
| Nerve Number | Cranial nerve X | Cranial nerve IX | Cranial nerve XII |
| Primary Functions | Parasympathetic (heart, GI), pharynx/larynx motor, visceral afferent | Taste (posterior 1/3 tongue), pharyngeal sensation/motor, parotid gland | Tongue motor control |
| Key Symptoms | Dysphonia, dysphagia, gastroparesis, bradycardia, vasovagal syncope | Throat pain, difficulty swallowing, absent gag reflex, referred ear pain | Tongue deviation, dysarthria, atrophy |
| Common Etiologies | Viral (post-COVID), neoplasm, surgical injury, idiopathic | Neoplasm, elongated styloid (Eagle syndrome), post-radiation | Skull base lesion, neck dissection, hypoglossal schwannoma |
| ICD-10-CM Code | G52.2 | G52.1 | G52.3 |
CDI Query Trigger — Specify the Cranial Nerve
When provider documentation states “cranial nerve disorder” or “vagal involvement” without explicitly naming CN X or the vagus nerve, a CDI query is warranted before assigning G52.2. The query should ask the provider to confirm: “Which specific cranial nerve is affected?” Documentation confirming CN X or vagus nerve justifies **G52.2; an unspecified response defaults to G52.9.
Manifestations & Symptom Burden
The vagus nerve’s broad course produces a wide range of clinical manifestations when disrupted:
- Dysphagia (difficulty swallowing): Results from impaired pharyngeal motor innervation; code separately with R13.10-R13.19 when documented
- Dysphonia / hoarseness: Caused by recurrent laryngeal branch involvement; code separately with R49.0 when documented
- Gastroparesis: Delayed gastric emptying from loss of gastric vagal innervation; code separately with K31.84 (diabetic) or K31.89 (other)
- Vasovagal syncope: Excessive vagal tone causing transient loss of consciousness; code separately with R55 when documented
- Cardiac arrhythmia (vagally mediated): Bradycardia or bradyarrhythmia secondary to vagal hyperactivity; code separately with I49.x as appropriate
- Autonomic dysfunction: Orthostatic hypotension, abnormal sweating; code separately with G90.3 (multi-system atrophy) or G90.9 as warranted
Coding Manifestations
💰 HCC Risk Adjustment (CMS-HCC v28)
| Field | Detail |
|---|---|
| CMS-HCC Model Version | v28 (2024-2025 Implementation) |
| HCC Assignment | ❌ Not HCC-Mapped |
| HCC Category | N/A |
| RAF Coefficient | N/A |
G52.2 does not map to an HCC category under CMS-HCC v28 and does not independently contribute to a patient’s RAF score.
Capture the Etiology for RAF Impact
While G52.2 itself carries no RAF weight, the underlying etiology often does. Diabetic autonomic neuropathy (E11.43 with G52.2 if vagal involvement is documented) maps to HCC 18 (Diabetes with Chronic Complications) and carries significant RAF weight. Similarly, if vagal neuropathy is caused by a malignancy, the neoplasm code drives HCC capture. Always code to the highest level of specificity, including etiology, to fully represent the patient’s clinical complexity.
🏥 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 | ~1.60 - 2.00 |
| DRG 092 | Other Disorders of Nervous System with CC | ~1.00 - 1.30 |
| DRG 093 | Other Disorders of Nervous System without CC/MCC | ~0.65 - 0.90 |
Approximate. Verify against IPPS FY2026 Final Rule tables.
Sequencing and Complications
When G52.2 is the reason for the inpatient admission, sequence it as the principal diagnosis — it will group to the DRG 091-093 triplet based on CC/MCC status of secondary diagnoses. G52.2 itself is not classified as a CC or MCC. Comorbidities such as aspiration pneumonia (J69.0 — MCC), respiratory failure (J96.00 — MCC), or dysphagia (R13.10 — CC) sequenced as secondary diagnoses will elevate grouping to DRG 092 or 091 respectively. Accurate and complete secondary diagnosis capture is critical for appropriate DRG weight.
🔗 Related ICD-10-CM Codes
G52 Sibling Codes — Other Cranial Nerve Disorders
| Code | Description |
|---|---|
| G52.2 | Disorders of vagus nerve ← This Code |
| G52.0 | Disorders of olfactory nerve |
| G52.1 | Disorders of glossopharyngeal nerve |
| G52.3 | Disorders of hypoglossal nerve |
| G52.7 | Disorders of multiple cranial nerves |
| G52.8 | Disorders of other specified cranial nerves |
| G52.9 | Cranial nerve disorder, unspecified |
Commonly Associated and Etiology-Driven Codes
| Code | Description |
|---|---|
| E11.43 | Type 2 diabetes mellitus with diabetic autonomic (poly)neuropathy |
| E10.43 | Type 1 diabetes mellitus with diabetic autonomic (poly)neuropathy |
| G90.3 | Multi-system atrophy (autonomic failure NOS) |
| R13.10 | Dysphagia, unspecified |
| R49.0 | Dysphonia |
| K31.84 | Gastroparesis |
| R55 | Syncope and collapse (vasovagal) |
| J69.0 | Pneumonitis due to inhalation of food and vomit (aspiration) |
🛠️ Commonly Associated CPT Codes (Neurology / Inpatient Consult)
Outpatient and Profee Setting Context
In the profee/outpatient setting, G52.2 is most commonly paired with nerve conduction and EMG studies, laryngeal EMG, and vagal nerve stimulator management codes. When an E/M and a diagnostic procedure are performed on the same day, Modifier -25 must be appended to the E/M to establish medical necessity for the separate service.
| CPT Code | Description | Profee Coding Notes |
|---|---|---|
| 95913 | Nerve conduction studies; 13 or more studies | Bill with G52.2 as the linking diagnosis; Modifier -25 on same-day E/M |
| 95867 | Needle EMG; cranial nerve supplied muscle(s), unilateral | Laryngeal EMG for CN X branch involvement; links directly to G52.2 |
| 95868 | Needle EMG; cranial nerve supplied muscle(s), bilateral | Use when bilateral vagal involvement with laryngeal EMG is performed |
| 95976 | Electronic analysis of implanted vagus nerve stimulator — simple programming | Applicable when patient has VNS implant; check NCCI for same-day E/M bundling |
| 99245 | Office consultation, high complexity (if payer accepts consult codes) | Use when neurologist performs a formal consultation for vagal neuropathy evaluation |
| 31575 | Laryngoscopy, flexible; diagnostic | Often performed by ENT to evaluate vocal cord paresis from recurrent laryngeal (vagal) branch involvement |
NCCI Bundling Considerations
- Nerve Conduction Study (95913) billed on the same day as an E/M service (99213-99215) requires Modifier -25 on the E/M to confirm the evaluation is a separate, identifiable service beyond what is required to order the NCS.
- Laryngeal EMG (95867 or 95868) billed with a laryngoscopy (31575) on the same day should be reviewed for NCCI edits; these may bundle depending on the provider and setting.
🔬 ICD-10-PCS Crosswalk (Inpatient Procedures)
When G52.2 is an inpatient diagnosis, these PCS codes are relevant for associated inpatient procedures.
| PCS Section | Body System | Root Operation | Clinical Application |
|---|---|---|---|
| 0 (Medical & Surgical) | 1 (Central Nervous System & Cranial Nerves) | B (Excision) | Surgical resection of vagus nerve tumor or neuroma — example PCS: 01BM0ZZ (Excision of vagus nerve, open approach) |
| 0 (Medical & Surgical) | 1 (Central Nervous System & Cranial Nerves) | N (Release) | Neurolysis/decompression of vagus nerve — example PCS: 01NM0ZZ (Release of vagus nerve, open approach) |
| 0 (Medical & Surgical) | 1 (Central Nervous System & Cranial Nerves) | Q (Repair) | Surgical repair of vagal nerve injury — example PCS: 01QM0ZZ (Repair of vagus nerve, open approach) |
| 0 (Medical & Surgical) | 1 (Central Nervous System & Cranial Nerves) | H (Insertion) | Vagal nerve stimulator lead placement — example PCS: 01HM0MZ (Insertion of neurostimulator lead, vagus nerve, open) |
💊 Coding Scenarios and Examples
Scenario 1 — Outpatient Neurology: New Onset Vagal Neuropathy with Dysphagia and Hoarseness
Clinical Vignette: A 58-year-old female presents to neurology clinic with a 6-week history of progressive hoarseness, difficulty swallowing solid foods, and intermittent sensation of food sticking in her throat. She reports a viral illness approximately 8 weeks prior. Flexible laryngoscopy performed in clinic reveals left vocal cord paresis consistent with recurrent laryngeal nerve (vagal branch) dysfunction. The neurologist documents “disorder of vagus nerve, left recurrent laryngeal branch involvement, likely post-viral.” Nerve conduction studies are ordered for the following week.
CPT / HCPCS (Profee):
- 99204-25 — Office visit, new patient, moderate complexity (Modifier -25 appended; E/M is separate from laryngoscopy)
- 31575 — Laryngoscopy, flexible; diagnostic (Performed same-day to evaluate vocal cord paresis)
ICD-10-CM:
- G52.2 — Disorders of vagus nerve (Principal/first-listed diagnosis; provider documented vagal etiology)
- R49.0 — Dysphonia (Documented hoarseness — manifestation, code as secondary)
- R13.10 — Dysphagia, unspecified (Documented swallowing difficulty — manifestation, code as secondary)
Scenario 2 — Inpatient: Vagal Neuropathy with Aspiration Pneumonia
Clinical Vignette: A 72-year-old male with known history of vagal neuropathy secondary to prior neck dissection for laryngeal squamous cell carcinoma (in remission) is admitted with fever, hypoxia, and radiographic evidence of right lower lobe consolidation. Pulmonology confirms aspiration pneumonia related to his chronic neurogenic dysphagia. The attending documents “aspiration pneumonia secondary to chronic vagal neuropathy with neurogenic dysphagia.”
Principal Diagnosis:
- J69.0 — Pneumonitis due to inhalation of food and vomit (Reason for admission — aspiration pneumonia; MCC)
Secondary Diagnoses:
- G52.2 — Disorders of vagus nerve (Underlying etiology of neurogenic dysphagia; chronic condition present on admission — POA: Y)
- R13.10 — Dysphagia, unspecified (Documented manifestation driving aspiration risk)
- Z85.21 — Personal history of laryngeal malignancy (Prior history of laryngeal cancer — in remission)
MS-DRG Assignment: J69.0 as principal sequences to MDC 04 (Respiratory System). G52.2 as a secondary diagnosis does not independently function as a CC/MCC; however, dysphagia (R13.10) may qualify as a CC under some grouper versions — verify against MS-DRG v43. The combination groups toward DRG 177/178/179 (Respiratory Infections & Inflammations).
Scenario 3 — CDI Query: Vague Autonomic Dysfunction Documentation
Clinical Vignette: A 64-year-old male with Type 2 diabetes is admitted for gastroparesis with intractable nausea and vomiting. The endocrinology note states “autonomic neuropathy — suspect vagal involvement given gastroparesis pattern.” The discharge summary lists “autonomic neuropathy” without naming the specific nerve or establishing a confirmed vagal origin.
Action / Outcome: The coder cannot assign G52.2 based on “suspect vagal involvement” — uncertain/probable diagnoses in the outpatient/profee setting require confirmation before assignment (per ICD-10-CM Official Guidelines Section IV.H). For inpatient coding, the “suspect” qualifier may allow assignment if it meets the “uncertain diagnosis” guideline (Section II.H) — but the query is still best practice for specificity. A CDI query should be sent: “The documentation references suspected vagal involvement in the patient’s autonomic neuropathy. Can you confirm whether the patient’s autonomic neuropathy is attributable to the vagus nerve (CN X) specifically, and whether this is related to the patient’s Type 2 diabetes?”
Query Response: Provider updates documentation to confirm: “Type 2 diabetic autonomic neuropathy with vagal involvement — gastroparesis is a direct manifestation of his diabetic vagal neuropathy.”
Corrected ICD-10-CM Coding:
- E11.43 — Type 2 diabetes mellitus with diabetic autonomic (poly)neuropathy (Etiology — HCC-mapped; drives RAF)
- G52.2 — Disorders of vagus nerve (Manifestation — vagal neuropathy confirmed by provider)
- K31.84 — Gastroparesis (Manifestation — document the clinical complication)
⚠️ Coding Pitfalls and Tips
| Pitfall or Tip | |
|---|---|
| ❌ | Assigning G52.9 when the vagus nerve is named. If provider documentation explicitly identifies CN X or “vagus nerve,” G52.9 (unspecified) is a specificity failure. Always assign [[G52.2]] when the vagus nerve is the documented affected nerve. |
| ❌ | Using G52.2 for diabetic autonomic neuropathy without pairing the etiology code. Diabetic vagal neuropathy requires both the diabetes code with autonomic neuropathy (E11.43 or E10.43) AND G52.2 per the etiology/manifestation sequencing convention — the diabetes code sequences first. |
| ❌ | Omitting manifestation codes. Vagal disorders produce codeable manifestations (dysphagia, dysphonia, gastroparesis, syncope). Coding only G52.2 without the manifestations understates the patient’s complexity and may reduce DRG weight. |
| ✅ | Query for etiology to unlock HCC capture. G52.2 alone has no RAF value, but diabetic autonomic neuropathy (E11.43) does. A targeted CDI query confirming the diabetic etiology can convert an HCC-neutral note into an HCC-mapped encounter. |
| ✅ | Append Modifier -25 when E/M and NCS/EMG are same-day. Any time a neurologist performs an evaluation AND a nerve conduction study or laryngeal EMG on the same date of service, Modifier -25 on the E/M is required to prevent bundling and ensure full reimbursement. |
| ✅ | Always code POA accurately for inpatient claims. When G52.2 is present on admission as a chronic condition, assign POA indicator “Y.” When it develops during the inpatient stay (e.g., new vagal injury post-procedure), assign POA “N” — this distinction affects HAC screening and quality metrics. |
📚 Sources
- Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS). ICD-10-CM Official Guidelines for Coding and Reporting, FY2026. https://www.cms.gov/medicare/coding-billing/icd-10-codes
- CMS/NCHS. ICD-10-CM Tabular List of Diseases and Injuries, FY2026 — Chapter 6 (G00-G99), Block G50-G59. https://www.cdc.gov/nchs/icd/icd-10-cm.htm
- AAPC. ICD-10-CM Code G52.2 — Disorders of Vagus Nerve. https://www.aapc.com/codes/icd-10-codes/G52.2
- CMS. 2025-2026 Medicare Advantage Risk Adjustment — CMS-HCC Model v28 ICD-10-CM Mappings. https://www.cms.gov/medicare/health-plans/medicareadvtgspecratestats/risk-adjustors
- CMS. IPPS Final Rule FY2026 — MS-DRG Definitions Manual v43. MDC 01 (Nervous System) logic tables. https://www.cms.gov/medicare/payment/prospective-payment-systems/acute-inpatient-pps
- AMA. CPT Professional Edition 2026. Neurology/Neuromuscular Procedures subsection (95860-95999) and Surgery/Respiratory System subsection (31500-31899).