Crystal's Coder Hub🧬 ICD-10 CM J38.01 — Paralysis of Vocal Cords and Larynx, Unilateral
Billable Code Confirmed
[ICD-10-CM] J38.01 is a valid, billable 6-character ICD-10-CM code for FY2026. Characters 1-3 (J38) define the vocal cord/larynx disease category; character 4 (.0) narrows to paralysis; characters 5-6 (.01) specify the unilateral type. No additional characters are required — this is a fully specified, terminal code.
Non-Billable Parent Codes — Never Submit These
- ❌
J38— 3-character header — no specificity (disease type, laterality unspecified)- ❌
J38.0— 5-character header — paralysis NOS, laterality not specifiedAlways submit J38.01 (all 6 characters) when unilateral vocal cord/laryngeal paralysis is confirmed by provider documentation or laryngoscopy findings.
Clinical Context: Unilateral vs. Bilateral vs. Unspecified Laterality
ICD-10-CM J38.01 captures unilateral vocal cord/laryngeal paralysis — one cord is affected. This is distinct from bilateral paralysis (J38.02), which carries a far more serious clinical picture including airway compromise and potential need for emergent tracheotomy. Unspecified laterality (J38.00) should only be used when the provider has not documented or clarified the affected side — always query or review laryngoscopy results to confirm laterality before defaulting to unspecified.
Code Classification
ICD-10-CM Diagnosis Code — wRVU, assistant payable, and global period fields are not applicable to this diagnosis code. See the CPT Procedural Crosswalk and ICD-10-PCS Crosswalk sections for procedure-level billing guidance.
🔍 Code Description
ICD-10-CM J38.01 classifies Paralysis of vocal cords and larynx, unilateral. This code represents a condition in which one true vocal cord is unable to move normally due to neurologic, iatrogenic, or structural disruption of the innervation pathway — most commonly the recurrent laryngeal nerve (RLN) or the vagus nerve.
The most common cause of unilateral vocal cord paralysis is iatrogenic injury to the RLN during thyroid surgery, anterior cervical spine surgery, or cardiothoracic procedures — but it may also result from malignant invasion (thyroid cancer, lung cancer, mediastinal masses), neurologic disease (stroke, multiple sclerosis), or remain idiopathic. Clinically, UVCP presents as hoarseness, breathy dysphonia, dysphagia, and aspiration risk — with the right RLN more often injured in thoracic surgery and the left RLN (with its longer intrathoracic course) more commonly affected by mediastinal pathology.
🌳 Code Tree / Hierarchy
J38 Diseases of vocal cords and larynx, not elsewhere classified ❌ Non-billable
│
├── J38.0 Paralysis of vocal cords and larynx ❌ Non-billable (5-character header)
│ │
│ ├── J38.00 Paralysis of vocal cords and larynx, unspecified ✅ Billable
│ ├── J38.01 Paralysis of vocal cords and larynx, unilateral ◀ THIS CODE ✅ Billable
│ └── J38.02 Paralysis of vocal cords and larynx, bilateral ✅ Billable
│
├── J38.1 Polyp of vocal cord and larynx ✅ Billable
├── J38.2 Nodules of vocal cords ✅ Billable
├── J38.3 Other diseases of vocal cords ✅ Billable
├── J38.4 Edema of larynx ✅ Billable
├── J38.5 Laryngeal spasm ✅ Billable
├── J38.6 Stenosis of larynx ✅ Billable
└── J38.7 Other diseases of larynx ✅ Billable
J38.00 vs. J38.01 — Laterality Matters More Than You Think
Submitting J38.00 (unspecified laterality) when the laryngoscopy report clearly identifies which cord is paralyzed is a specificity error. Payers — especially for surgical prior authorizations (thyroplasty, injection laryngoplasty) — require J38.01 or J38.02 to establish medical necessity. Always cross-reference the laryngoscopy or stroboscopy report to confirm the affected side before coding.
✅ Includes
The following clinical terms and scenarios map to J38.01 when documented:
- Unilateral vocal cord paralysis (UVCP)
- Unilateral vocal fold paralysis (UVFP)
- Unilateral recurrent laryngeal nerve (RLN) paralysis
- Unilateral laryngeal paralysis
- Left vocal cord paralysis (if provider documents as unilateral)
- Right vocal cord paralysis (if provider documents as unilateral)
- Post-thyroidectomy unilateral vocal cord paralysis
- Post-cardiac surgery unilateral vocal cord paralysis (left RLN injury)
- Vagus nerve injury resulting in unilateral vocal cord immobility
❌ Excludes
Excludes 1 — Cannot Be Coded Simultaneously with J38.01
| Code | Description | Note |
|---|---|---|
| P28.89 | Congenital laryngeal stridor | Applies to neonates; J38 category is excluded for congenital laryngeal stridor — never assign J38.01 alongside this code |
| J05.0 | Obstructive laryngitis (acute) | Mutually exclusive inflammatory etiology — if acute obstructive laryngitis is causing laryngeal restriction, code J05.0 only |
| J95.5 | Postprocedural subglottic stenosis | Structural complication vs. neurologic paralysis — mutually exclusive; code the correct postprocedural complication |
| R06.1 | Stridor, NOS | Once vocal cord paralysis is confirmed as the cause of stridor, R06.1 is excluded — code J38.01 only |
| J04.0 | Ulcerative laryngitis | Mutually exclusive inflammatory condition |
Excludes 1 Violation Risk — Stridor and Confirmed VCP
A common Excludes 1 trap: A coder may see both “stridor” documented in the H&P and vocal cord paralysis confirmed on laryngoscopy and attempt to code both R06.1 and J38.01. Do not code R06.1 when the confirmed etiology is vocal cord paralysis. R06.1 is excluded when the cause has been identified — J38.01 already captures the full clinical picture. Code only J38.01.
Excludes 2 — May Be Coded in Addition if Separately Present
No Excludes 2 notes specific to J38.01 in the FY2026 tabular. Associated underlying conditions and etiology codes are coded per standard etiology/manifestation and “code also underlying condition” guidelines.
📋 Clinical Overview
Unilateral vs. Bilateral vs. Unspecified — Code Selection Guide
Accurate laterality coding is the key coding decision point for J38.0x. The clinical and coding implications differ significantly between unilateral and bilateral presentations.
| Feature | J38.01 — Unilateral | J38.02 — Bilateral | J38.00 — Unspecified |
|---|---|---|---|
| Vocal cords affected | One cord (L or R) | Both cords | Not documented |
| Primary symptom | Breathy dysphonia, hoarseness, aspiration | Stridor, dyspnea, airway compromise | Not clarified |
| Airway status | Usually patent — airway not immediately threatened | High risk — potential for complete airway obstruction | Unknown |
| Common etiology | RLN injury (thyroid surgery, thoracic surgery, malignancy) | Bilateral RLN injury, neurodegenerative disease | Pre-diagnostic or vague documentation |
| Surgical management | Medialization thyroplasty (CPT 31591), injection laryngoplasty (CPT 31513/31570) | Tracheotomy (CPT 31600), arytenoidectomy | Depends on workup |
| DRG pathway | MDC 03 — ENT O.R. or medical | MDC 03 — may involve MDC 04 (Respiratory) if airway failure | MDC 03 |
| Use for prior auth | ✅ Required for thyroplasty/injection | ✅ Required for tracheotomy, arytenoidectomy | ❌ Usually insufficient — payer may deny |
CDI Query Trigger — "Hoarseness Post-Thyroidectomy" Without Confirmed VCP
Post-thyroidectomy hoarseness is common but not automatically codeable as J38.01 without provider confirmation of vocal cord paralysis (typically via laryngoscopy). If the record documents “hoarseness following thyroidectomy” but no laryngoscopy result is available and the provider has not stated “vocal cord paralysis,” query before coding J38.01. The correct code may be R49.0 (dysphonia) or the hoarseness may be a postprocedural complication coded as J95.89 until paralysis is confirmed.
Manifestations & Symptom Burden
Unilateral vocal cord paralysis produces a distinct symptom cluster that should be coded additionally when documented:
- Dysphonia / hoarseness: R49.0 — code as secondary when dysphonia is separately documented as a clinical concern beyond the paralysis diagnosis itself
- Aspiration: J69.0 (Pneumonitis due to solids and liquids) or R13.10 (Dysphagia, unspecified) — aspiration and dysphagia are common and clinically significant downstream effects; code when documented
- Dysphagia: R13.10-R13.19 — select appropriate dysphagia code based on phase documented (oropharyngeal, esophageal, etc.)
- Postprocedural etiology: When paralysis is a direct result of thyroid surgery, anterior cervical surgery, or cardiothoracic surgery, assign the appropriate complication code to link etiology: e.g., J95.89 (Other postprocedural complications of respiratory system) or T81.89XA/D/S
- Underlying malignancy (if etiology): **C73 (**Thyroid malignancy), C34.10-C34.12 (Lung cancer), C77.1 (Secondary malignancy, intrathoracic lymph nodes) — code the underlying cause when documented as driving the paralysis
Always Code the Underlying Etiology
ICD-10-CM guidelines direct coders to code the underlying etiology alongside J38.01 whenever it is documented. If the provider states “unilateral vocal cord paralysis secondary to thyroid cancer,” assign C73 and J38.01 — sequence the etiology (C73) first if it drove the admission, or as secondary if VCP is the reason for the encounter. This is not optional — it is required for complete and accurate coding.
💰 HCC Risk Adjustment (CMS-HCC v28)
| Field | Detail |
|---|---|
| CMS-HCC Model Version | v28 (2024-2026 Implementation) |
| HCC Assignment | ❌ Not HCC-Mapped |
| HCC Category | N/A |
| RAF Coefficient | N/A |
J38.01 does not map to an HCC category under CMS-HCC v28 and does not independently contribute to the RAF score.
Code the Underlying Cause for HCC Capture
While J38.01 itself is not HCC-mapped, the underlying etiology driving the vocal cord paralysis often IS HCC-mapped and must be captured. Examples: thyroid malignancy (C73 → HCC 12), lung cancer (C34.- → HCC 9/10), stroke (I63.- → HCC 100), or neurodegenerative disease. Failing to code the etiology is an HCC miss. Always chase the “why” behind J38.01.
🏥 MS-DRG Assignment
MDC 03 — Diseases and Disorders of the Ear, Nose, Mouth and Throat
| DRG | Title | Est. Relative Weight* |
|---|---|---|
| DRG 154 | Other Ear, Nose, Mouth & Throat O.R. Procedures with MCC | ~2.80-3.50 |
| DRG 155 | Other Ear, Nose, Mouth & Throat O.R. Procedures with CC | ~1.60-2.00 |
| DRG 156 | Other Ear, Nose, Mouth & Throat O.R. Procedures without CC/MCC | ~1.10-1.40 |
Approximate. Verify against IPPS FY2026 Final Rule tables (CMS.gov).
Sequencing and Complications
J38.01 does NOT function as a CC or MCC when coded as a secondary diagnosis — it does not independently shift DRG weight. When J38.01 is principal (e.g., admission for medialization thyroplasty or injection laryngoplasty), it drives the MDC 03 DRG pathway and surgical procedures will determine the final DRG tier (154/155/156). If the paralysis is a postoperative complication of thyroid or thoracic surgery, coding should follow complication guidelines — the complication code sequences as principal, not J38.01, unless circumstances warrant otherwise per UHDDS guidelines. Concurrent aspiration pneumonia (J69.0) coded as a secondary diagnosis CAN serve as an MCC or CC depending on the grouper logic and should be captured to optimize DRG weight.
🔗 Related ICD-10-CM Codes
Vocal Cord/Larynx Paralysis Laterality Variants
| Code | Description |
|---|---|
| J38.01 | Paralysis of vocal cords and larynx, unilateral ← This Code |
| J38.00 | Paralysis of vocal cords and larynx, unspecified |
| J38.02 | Paralysis of vocal cords and larynx, bilateral |
Other Vocal Cord/Larynx Conditions (J38 Siblings)
| Code | Description |
|---|---|
| J38.1 | Polyp of vocal cord and larynx |
| J38.2 | Nodules of vocal cords (vocal cord nodules) |
| J38.3 | Other diseases of vocal cords |
| J38.4 | Edema of larynx |
| J38.5 | Laryngeal spasm |
| J38.6 | Stenosis of larynx |
Common Etiological / Associated Codes
| Code | Description |
|---|---|
| C73 | Malignant neoplasm of thyroid gland (common cause) |
| C34.10 | Malignant neoplasm of upper lobe bronchus/lung, unspecified (left RLN invasion) |
| C77.1 | Secondary malignant neoplasm of intrathoracic lymph nodes (left RLN compression) |
| J95.89 | Other postprocedural complications of respiratory system (iatrogenic RLN injury) |
| R49.0 | Dysphonia / hoarseness (manifestation — code additionally when documented) |
| R13.10 | Dysphagia, unspecified (common manifestation — code additionally) |
| J69.0 | Pneumonitis due to solids and liquids (aspiration — code when documented) |
🛠️ Commonly Associated CPT Codes (ENT / Head & Neck Surgery / Pulmonology)
Outpatient and Profee Setting Context
J38.01 is the primary supporting diagnosis for diagnostic laryngoscopy, stroboscopy, vocal fold injection, and medialization thyroplasty. In the inpatient profee setting, ENT or head-and-neck surgery consultants billing for laryngoscopy or surgical management of VCP should ensure J38.01 (not J38.00) is the supporting diagnosis code on all claims to meet payer medical necessity requirements and avoid prior auth denials.
| CPT Code | Description | Profee Coding Notes |
|---|---|---|
| 31575 | Laryngoscopy, flexible; diagnostic | Primary diagnostic procedure; bill with Modifier -26 for professional interpretation; supported by J38.01 |
| 31591 | Laryngoplasty, medialization, unilateral (Thyroplasty Type I) | Definitive surgical correction of UVCP — requires J38.01 (NOT J38.00) for prior auth and medical necessity |
| 31513 | Laryngoscopy, indirect; with vocal cord injection | Transcervical injection laryngoplasty approach — supported by J38.01 |
| 31570 | Laryngoscopy, direct; with injection into vocal cord(s), therapeutic | Direct injection under general anesthesia — supported by J38.01 |
| 31576 | Laryngoscopy, flexible; with biopsy | When concurrent tissue sampling is required to establish or confirm etiology |
| 92520 | Laryngeal function studies (laryngeal stroboscopy) | Objective voice assessment — requires J38.01 or R49.0 for coverage |
| 31600 | Tracheotomy | Used if bilateral paralysis (J38.02) or if UVCP leads to acute airway compromise; not routine for J38.01 |
NCCI Bundling Considerations
- Flexible diagnostic laryngoscopy (31575) performed on the same date as surgical laryngoscopy with injection (31570) — 31575 is typically bundled into 31570; do NOT bill 31575 separately unless it was performed at a distinctly separate patient encounter. Modifier -59 with strong documentation may unbundle if circumstances genuinely warrant it.
- E/M service (99213-99215) billed same date as laryngoscopy requires Modifier -25 on the E/M to demonstrate a separately identifiable medical decision-making service beyond the pre-procedure assessment for the laryngoscopy.
🔬 ICD-10-PCS Crosswalk (Inpatient Procedures)
When J38.01 is an inpatient diagnosis, these PCS codes are relevant for associated inpatient procedures.
| PCS Section | Body System | Root Operation | Clinical Application |
|---|---|---|---|
| 0 (Medical & Surgical) | C (Mouth & Throat) | S (Reposition) | Medialization thyroplasty — repositioning of the vocal cord via implant through thyroid cartilage window; example PCS: 0CSS0ZZ (Reposition Larynx, Open Approach) |
| 0 (Medical & Surgical) | C (Mouth & Throat) | H (Insertion) | Implant insertion for medialization — example PCS: 0CHN0ZZ (Insertion into Vocal Cord, Open) |
| 0 (Medical & Surgical) | C (Mouth & Throat) | J (Inspection) | Direct laryngoscopy for diagnostic visualization — example PCS: 0CJS8ZZ (Inspection of Larynx, Via Natural or Artificial Opening Endoscopic) |
| 5 (Extracorporeal or Systemic Assistance) | A (Physiological Systems) | 0 (Assistance) | Respiratory support if airway compromise develops — example PCS: 5A09357 (Respiratory Ventilation, CPAP) |
💊 Coding Scenarios and Examples
Scenario 1 — Outpatient/Profee: New UVCP Diagnosis Post-Thyroidectomy
Clinical Vignette: A 48-year-old female presents to ENT clinic 3 weeks after total thyroidectomy for papillary thyroid carcinoma. She reports significant hoarseness and difficulty swallowing liquids. Flexible laryngoscopy in office reveals the left true vocal cord in the paramedian position with absent adduction on phonation. ENT documents “left unilateral vocal cord paralysis, likely secondary to left recurrent laryngeal nerve injury during thyroidectomy.” Injection laryngoplasty is discussed and a prior authorization is initiated.
CPT (Profee):
- 99214 — Office E/M, established, moderate complexity (new post-surgical complication with laryngoscopy-confirmed VCP)
- 31575 — Flexible laryngoscopy, diagnostic (Modifier -25 on E/M required)
ICD-10-CM:
- J38.01 — Paralysis of vocal cords and larynx, unilateral (confirmed by laryngoscopy — primary diagnosis for encounter)
- C73 — Malignant neoplasm of thyroid gland (underlying malignancy — etiology of the surgery causing RLN injury; active condition)
- J95.89 — Other postprocedural complications of respiratory system (iatrogenic RLN injury as post-thyroidectomy complication)
- R13.12 — Dysphagia, oropharyngeal phase (separately documented symptom requiring management)
Scenario 2 — Inpatient: Admission for Medialization Thyroplasty
Clinical Vignette: A 62-year-old male with known left UVCP secondary to prior anterior cervical discectomy and fusion (ACDF) at C5-C6 is admitted for elective left medialization thyroplasty (Thyroplasty Type I). The patient has failed voice therapy and temporary vocal cord injection over 8 months. Laryngoscopy confirms persistent left vocal cord paralysis in the lateral position with no spontaneous return of function. ENT performs open medialization laryngoplasty under general anesthesia with Montgomery implant placement.
Principal Diagnosis:
- J38.01 — Paralysis of vocal cords and larynx, unilateral (reason for admission — definitive surgical correction)
Secondary Diagnoses:
- J95.89 — Other postprocedural complications of respiratory system (iatrogenic RLN injury from ACDF — documented etiology)
- R49.0 — Dysphonia (active symptom requiring surgical management)
- M47.12 — Spondylosis with myelopathy, cervical region (underlying condition requiring original ACDF)
MS-DRG Assignment: With open medialization laryngoplasty (PCS: 0CSS0ZZ — Reposition Larynx, Open), this admission groups to DRG 154-156 (Other ENT O.R. Procedures) under MDC 03. Presence of M47.12 as a CC elevates grouping to DRG 155 (with CC), increasing relative weight. J38.01 as principal does not itself function as a CC/MCC, but the secondary diagnoses can shift the tier.
Scenario 3 — CDI Query: Post-Thyroidectomy Hoarseness Without Laryngoscopy-Confirmed VCP
Clinical Vignette: A 55-year-old male is admitted for acute dysphagia and aspiration event 5 days after total thyroidectomy for thyroid malignancy. The H&P notes “hoarseness and aspiration following thyroidectomy — concern for RLN injury.” No laryngoscopy has been performed during this admission, and the ENT consultation note states “hoarseness likely from intubation vs. RLN injury — recommend outpatient laryngoscopy after discharge.”
Action / Outcome: The coder cannot assign J38.01 without a confirmed diagnosis of vocal cord paralysis documented by the treating physician in the current admission. The ENT note uses hedging language (“likely from… vs.“) — this is a “possible/probable” scenario, which cannot be coded as confirmed in the outpatient/profee setting per Official Guidelines Section IV. A CDI query is warranted to ask whether a confirmed diagnosis of vocal cord paralysis can be established based on clinical evidence available during this admission, or whether aspiration is being managed as a separate issue.
Query Response: ENT updates the note: “Based on post-thyroidectomy course, clinical presentation, and absence of return of normal vocal cord function, I believe this patient has left unilateral recurrent laryngeal nerve injury with resulting left vocal cord paralysis. Recommend outpatient flexible laryngoscopy for confirmation, but clinically consistent with post-thyroidectomy UVCP.”
Corrected ICD-10-CM Coding:
- J38.01 — Paralysis of vocal cords and larynx, unilateral (now confirmed by treating ENT physician — acceptable to code as confirmed)
- C73 — Malignant neoplasm of thyroid gland (underlying malignancy — etiology of thyroidectomy)
- J69.0 — Pneumonitis due to solids and liquids (aspiration event — principal or secondary depending on sequencing)
- J95.89 — Other postprocedural complications of respiratory system (iatrogenic RLN injury)
⚠️ Coding Pitfalls and Tips
| Pitfall or Tip | |
|---|---|
| ❌ | Using J38.00 (unspecified laterality) when laterality is documented. Laryngoscopy reports will state left or right — if it’s documented, code J38.01. J38.00 may trigger payer denials for thyroplasty and injection laryngoplasty prior authorizations, as payers expect laterality to be specified. |
| ❌ | Coding J38.01 for post-thyroidectomy hoarseness without confirmed VCP. Hoarseness alone does not equal vocal cord paralysis. Until the provider confirms VCP (ideally via laryngoscopy), code R49.0 (dysphonia) or J95.89 as appropriate. Never assume the diagnosis — query. |
| ❌ | Coding R06.1 (stridor) alongside J38.01. The Excludes 1 note at J38 prohibits coding stridor NOS (R06.1) when the confirmed etiology is vocal cord disease. Once VCP is established as the cause of the stridor, R06.1 is excluded — J38.01 is the complete code. |
| ❌ | Missing the etiology code. J38.01 rarely stands alone in a well-coded claim. When the cause is documented (thyroid cancer, lung malignancy, iatrogenic injury, stroke), code the etiology. Failure to capture malignancy codes (C73, C34.-) is an HCC miss that understates the patient’s true clinical burden. |
| ✅ | Always chase the “why” behind J38.01. The most valuable coding work happens in establishing the cause — is this post-thyroidectomy? Post-cardiac surgery? Malignant invasion? The etiology codes are where HCC value lives. J38.01 itself is not HCC-mapped, but C73 (thyroid malignancy) and C34.- (lung malignancy) are. |
| ✅ | Code aspiration and dysphagia when documented. UVCP with aspiration (J69.0) or dysphagia (R13.1x) reflects the true clinical complexity of the patient. These manifestation codes support medical necessity for intensive speech therapy, modified diet orders, and inpatient monitoring — and they tell the full clinical story for DRG and quality reporting. |
| ✅ | Confirm post-surgical timing for complication coding. When UVCP is documented as a direct result of a prior procedure, J95.89 (postprocedural complication) should be considered alongside J38.01. Proper complication coding is a compliance and quality measure issue — ICD-10-CM Official Guidelines Section I.C.19.a govern this sequencing. |