Crystal's MCW Coder Hub🧬 ICD-10 H02.422 - Myogenic Ptosis of Left Eyelid
Quick Reference Table
| Element | Value |
|---|---|
| ICD-10 Code | H02.422 |
| Diagnosis | Myogenic ptosis of left eyelid |
| Parent Category | H02.42 - Myogenic ptosis of eyelid |
| Chapter | VII - Diseases of the eye and adnexa (H00-H59) |
| Section | H00-H05 - Disorders of eyelid, lacrimal system and orbit[ |
| Laterality | Left upper eyelid (OS) |
| Mechanism | Levator (and/or Müller’s) muscle weakness or myopathy |
| Common Etiologies | Chronic progressive external ophthalmoplegia, ocular myasthenia, muscular dystrophies, myopathic levator dysfunction |
| Functional Impact | Variable/constant drooping, superior field loss, chin-up posture, brow fatigue |
| Billable | ✓ Yes (specific, reportable) |
| Requires 7th Digit | ✗ No |
| HCC Status | No (non-HCC) |
| Excludes1 | Congenital malformations of eyelid (Q10.0-Q10.3) |
Short Definition
ICD-10 CM H02.422 is a billable ICD-10-CM code for myogenic ptosis of the left eyelid, meaning the left upper eyelid droops due to primary muscle weakness or myopathic dysfunction of the levator palpebrae superioris and/or Müller’s muscle, rather than purely neurogenic, mechanical, or aponeurotic causes.
Full Description
What Is Myogenic Ptosis?
Ptosis = drooping of the upper eyelid; myogenic ptosis is a subtype where the primary problem lies in the eyelid elevator muscle(s) themselves.
Key characteristics:
- Levator muscle weakness (limited lid elevation).
- Often associated with reduced/absent levator function on exam (measured in mm).
- May be bilateral or unilateral; H02.422 is used when the left eyelid is specifically affected.
- Seen in:
- Chronic progressive external ophthalmoplegia (CPEO) - mitochondrial myopathy.
- Ocular myasthenia gravis - autoimmune neuromuscular junction disease (sometimes classified neuromuscular, but clinically overlaps).[4][6]
- Myotonic dystrophy and other muscular dystrophies.
- Idiopathic or degenerative myopathic changes of the levator complex.[4][6][7]
In H02.422, the documentation should clearly indicate myogenic (muscle-based) ptosis affecting the left eyelid.
Clinical Features
Symptoms:
- Drooping of left upper lid (OS), worse with fatigue in neuromuscular cases (e.g., ocular myasthenia).
- Difficulty reading, driving, or doing near work due to lid blocking visual axis.
- “Heavy eyelid” sensation, brow fatigue, frontal headaches.
- Possible diplopia if associated with extraocular muscle involvement (CPEO, myasthenia).
Signs:
- Decreased levator function OS (e.g., <10-12 mm).
- Low MRD1 (margin-reflex distance) OS.
- Poor eyelid excursion on upgaze.
- In myasthenia: fatigable ptosis - worsens over the day; improves with rest or ice pack test.
- In CPEO: both eyelid ptosis and restricted extraocular movements with poor Bell’s phenomenon.
Coding Specifics
Code Structure Breakdown
| Characters | Value | Meaning |
|---|---|---|
| 1st-3rd | H02 | Other disorders of eyelid |
| 4th | .4 | Ptosis of eyelid |
| 5th-6th | 22 | Myogenic ptosis of left eyelid |
H02.429 is the family code for myogenic ptosis of eyelid, and H02.422 is the left-sided child code.
When to Use H02.422
Use H02.422 when:
- Documentation explicitly states “myogenic ptosis” OR clearly describes muscle-based levator weakness.
- Laterality is left eyelid (OS).
- Ptosis is acquired or due to a myopathic process (not congenital malformation).
- The primary defect is in the muscle (e.g., CPEO, muscular dystrophy, ocular myasthenia gravis levator involvement), not just dermatochalasis or scar tethering.
Do NOT use H02.422 when:
- Ptosis is mechanical (e.g., heavy dermatochalasis, tumor, scar, edema) → use H02.412 (mechanical ptosis of left eyelid).
- Ptosis is paralytic/neurogenic (e.g., CN III palsy, Horner syndrome) → use H02.432 (paralytic ptosis of left eyelid).
- Ptosis is unspecified cause without mention of myogenic → use H02.402 (unspecified ptosis of left eyelid).
- Ptosis is congenital eyelid malformation → use Q10.0-Q10.3 (Excludes1).
- The right eyelid or both eyelids are affected:
- Right myogenic ptosis → H02.421.
- Bilateral myogenic ptosis → H02.423.
Related ICD-10 Codes
| Code | Description | When to Use |
|---|---|---|
| H02.422 | Myogenic ptosis of left eyelid | Left eyelid, muscle-based ptosis (THIS) |
| H02.421 | Myogenic ptosis of right eyelid | Right eyelid myogenic ptosis |
| H02.423 | Myogenic ptosis of bilateral eyelids | Both eyelids myogenic ptosis |
| H02.429 | Myogenic ptosis of unspecified eyelid | Ptosis described as myogenic, no laterality in chart |
| H02.412 | Mechanical ptosis of left eyelid | Ptosis from excess skin, mass, scar, edema |
| H02.432 | Paralytic ptosis of left eyelid | Ptosis from neurogenic cause (CN III, Horner, etc.) |
| H02.402 | Unspecified ptosis of left eyelid | Cause not documented as mechanical/myogenic/paralytic |
| Q10.0-Q10.3 | Congenital eyelid malformations | Congenital ptosis, blepharophimosis syndrome |
HCC Status
- H02.422 is NOT an HCC code.
- Myogenic ptosis is a localized eyelid disorder, not a chronic systemic disease used for CMS-HCC risk adjustment.
- However, the underlying systemic disease that causes myogenic ptosis (e.g., myasthenia gravis, muscular dystrophy, mitochondrial disease) may carry HCC weight and should be coded separately when documented (e.g., G70.00 for myasthenia gravis).
Documentation Requirements
Minimum Documentation Elements
For accurate use of H02.422, provider documentation should include:
-
Diagnosis & Mechanism
- “Myogenic ptosis OS” or “…ptosis of left upper eyelid due to levator myopathy.”
- Distinguish from mechanical or paralytic causes.
-
Laterality
- Clearly state left upper eyelid involvement.
-
Etiology / Underlying Disease
- E.g., “Myogenic ptosis OS in the setting of ocular myasthenia gravis.”
- Or, “Myogenic ptosis OS associated with CPEO (chronic progressive external ophthalmoplegia).”
-
Functional Impact
- Visual symptoms (field loss, reading difficulty, driving issues).
- Head tilt, brow fatigue, or need to raise lid manually.
-
Objective Measurements
- MRD1 (margin-reflex distance) OS.
- Levator function OS (mm of excursion).
- Photos and visual field results for surgical cases.
-
Course
- Fatigability, variability (e.g., worsening later in day in MG).
- Stability vs progression (especially in CPEO or muscular dystrophies).
Auditor Red Flags
- Documentation simply says “ptosis OS” without “myogenic” or clear muscle-based explanation → should default to H02.402, not H02.422.
- Chart clearly indicates mechanical or paralytic etiology, but H02.422 (myogenic) is used.
- Coding congenital ptosis with H02.422 instead of Q10.x despite documentation stating “since birth” or “congenital.”
- No underlying neuromuscular diagnosis coded when clearly documented (e.g., myasthenia gravis omitted).
Associated CPT Codes
E/M and Eye Exam
| CPT | Description | Context |
|---|---|---|
| 99202-99205 | New office/clinic visit | Initial myogenic ptosis evaluation |
| 99212-99215 | Established visit | Follow-up, pre-/post-op |
| 92002-92004 | New ophthalmological services | Oculoplastic/neuro-ophthalmic intake[4] |
| 92012-92014 | Established ophthalmological services | Ongoing monitoring |
Diagnostics (Ophthalmic & Neuromuscular)
| CPT | Description | Use |
|---|---|---|
| 92081-92083 | Visual field testing | Document superior field loss and functional impact |
| 92285 | External ocular photography | Pre-op photos for ptosis repair/insurance |
| 92133 | OCT of optic nerve (if needed) | Usually more for optic nerve, but may be used to rule out other pathology |
| 95885-95886 | EMG / repetitive nerve stimulation | Myasthenia or neuromuscular disease workup (neurology) |
| 92201-92202 | Extended ophthalmoscopy (if indicated) | Detailed nerve/macula drawings |
Surgical Procedures (If Ptosis Repair Is Performed)
| CPT | Description | Notes |
|---|---|---|
| 67901-67908 | Repair of blepharoptosis (various techniques) | Levator resection, advancement, frontalis suspension; may be used in myogenic ptosis[4] |
| 15822-15823 | Upper eyelid blepharoplasty | For dermatochalasis if present; may be adjunct to ptosis repair |
| 67900 | Repair of lid margin/defect | If prior trauma or surgery contributes |
Functional ptosis surgery often requires documented myogenic etiology plus field loss and functional complaints to differentiate from cosmetic procedures in payer policies.
Example ICD-10 Combinations
-
Myasthenia Gravis with Myogenic Ptosis OS
- H02.422 - Myogenic ptosis of left eyelid
- G70.00 - Myasthenia gravis without acute exacerbation
-
CPEO-Related Ptosis
- H02.422 - Myogenic ptosis of left eyelid
- G71.3 - Mitochondrial myopathy / CPEO (depending on local mapping)
-
Muscular Dystrophy with Ptosis
- H02.422 - Myogenic ptosis of left eyelid
- G71.0 - Muscular dystrophy (if appropriate type documented)
Sample Documentation (Work-Ready)
Chief Complaint: Droopy left eyelid, worse at end of day.
HPI: 54-year-old female with known ocular myasthenia gravis presents with progressive drooping of the left upper eyelid over the past 6 months. Ptosis worsens in the evening and improves with rest. Reports eye fatigue and difficulty reading in the evening due to the left lid partially covering her visual axis. No significant pain or visual loss; some intermittent diplopia in far gaze.
Exam:
- MRD1: OD 3.0 mm, OS 0.5 mm.
- Levator function: OD 13 mm, OS 7 mm.
- Fatigability: Sustained upgaze for 60 seconds leads to further droop OS by ~2 mm.
- Ice pack test: Improvement in OS ptosis ~2 mm after 2 minutes.
- Visual fields: Mild superior field deficit OS, improved when lid is lifted manually.
Assessment:
- Myogenic ptosis of left eyelid in the setting of ocular myasthenia gravis, with fatigable component and functional visual symptoms.
Plan:
- Adjust systemic MG therapy with neurology.
- Consider ptosis repair if symptoms remain functionally limiting after medical optimization.
- Pre-op photos and updated visual fields if surgery planned.
ICD-10:
- H02.422 - Myogenic ptosis of left eyelid
- G70.00 - Myasthenia gravis without exacerbation
CPT (today):
Billing & Compliance Pearls
- Ensure “myogenic” is explicitly documented before using H02.422; otherwise, default to unspecified ptosis code.[2][8]
- Always code underlying systemic disease (MG, CPEO, muscular dystrophy), which may carry its own risk and utilization profile.
- For functional ptosis surgery:
- Document myogenic etiology, levator weakness, MRD1, visual field loss, and improvement with lid elevation.
- Attach fields + photos to meet payer criteria for medical necessity, not cosmetic enhancement.[8][10]
References
[1] Chapter outline for H00-H06 showing H02 as “Other disorders of eyelid” and listing H02.4 as ptosis of eyelid in the eye/adnexa chapter.[web:788]
[2] ICD-10-CM entry for H02.422 - Myogenic ptosis of left eyelid, including placement under H02.42 and Excludes1 for congenital eyelid malformations Q10.0-Q10.3.[web:927][web:932][web:933]
[3] ICD-10-CM chapter H00-H59 structure for diseases of the eye and adnexa, including eyelid disorders.[web:781][web:855]
[4] Clinical descriptions of ptosis (eyelid), including categorization into myogenic, neurogenic, aponeurotic, mechanical, and traumatic causes.[web:831][web:858]
[5] Overview of eyelid and orbit disorders in the H00-H06 range, with myogenic ptosis as a distinct mechanism.[web:836]
[6] Ocular myasthenia and its presentation with fatigable ptosis and neuromuscular weakness.[web:924]
[7] Chronic progressive external ophthalmoplegia and its association with adult-onset myogenic ptosis.[web:926]
[8] AAPC and coding references for H02.4x and H02.42x series (myogenic ptosis of eyelid) with laterality options and Excludes1 notes.[web:843][web:932]
[9] Supplemental ICD-10-CM code descriptions for H02.422 from other code compendia (GenHealth, FindACode, NIH VSAC).[web:930][web:931][web:936]
[10] Ophthalmology coding guidance emphasizing documentation for ptosis repair medical necessity, including etiology, visual field loss, and functional impact.[web:935]