Crystal's MCW Coder Hub👁️ ICD-10-CM H02.054 — Trichiasis Without Entropion, Left Upper Eyelid
Billable Code — No Warning Needed
ICD-10-CM H02.054 is a valid, billable, fully specified 6-character ICD-10-CM code for FY2026. All six characters are present and meaningful:
H02(other disorders of eyelid) +.05(trichiasis without entropion) +4(left upper eyelid). This code specifically designates misdirected lashes of the left upper eyelid only, with the left upper lid margin confirmed to be in a normal anatomic position — the essential qualifier that separates this code from the entropion family.
Non-Billable Parent Codes
- ❌
H02.05— 5-character header — missing laterality and lid specificity- ❌
H02.0— 4-character header — non-billable, no specificity- ❌
H02.056— left eye, unspecified eyelid — do not use when documentation clearly states left upper lid Always submit H02.054 (all 6 characters) when left upper eyelid trichiasis is documented.
Left Eye = -LT Modifier and -E1 for Per-Lid Payers
Every CPT code billed for the left eye must carry the -LT modifier. For per-lid payers, use -E1 (upper left eyelid). A laterality mismatch — H02.054 (left) paired with -RT on the procedure line — is a claim denial and an audit red flag. Always verify your diagnosis laterality and procedure modifier are pointing to the same eye and same lid before submission.
🔍 Code Description
ICD-10-CM H02.054 classifies trichiasis of the left upper eyelid occurring without concurrent entropion — one or more upper eyelashes of the left eye are growing inward toward the corneal or conjunctival surface while the left upper eyelid margin remains in its normal anatomical position. With each blink, the misdirected lash(es) mechanically abrade the superior cornea and superior bulbar conjunctiva, producing a repeating cycle of epithelial microtrauma, reflex tearing, inflammatory response, and — if untreated — progressive corneal scarring.
H02.054 is the direct left-eye mirror of H02.051 (right upper eyelid). The clinical picture, diagnostic criteria, treatment options, and coding logic are identical — the sole distinction is laterality. All guidance in this note applies equally to H02.051 with the substitution of right-eye modifiers (-RT, -E3). When reviewing the chart, always confirm whether the fellow right upper lid (H02.051) is also affected, and whether the left lower lid (H02.055) has concurrent involvement — both are common in cicatricial disease patients and must each be captured with their own code.
🌳 Code Tree / Hierarchy
H02.0 Entropion and trichiasis of eyelid ❌ Non-billable header
│
└── H02.05 Trichiasis without entropion ❌ Non-billable header
│
├── H02.051 Right upper eyelid ✅ Billable (right-eye mirror of this code)
├── H02.052 Right lower eyelid ✅ Billable
├── H02.053 Right eye, unspecified eyelid ✅ (only if lid not documented)
├── H02.054 Left upper eyelid ◀ THIS CODE ✅
├── H02.055 Left lower eyelid ✅ Billable
├── H02.056 Left eye, unspecified eyelid ✅ (only if lid not documented)
└── H02.059 Unspecified eye, unspecified eyelid ⚠️ Last resort only
H02.054 vs. Adjacent Laterality and Lid Codes
| Code | Eye | Lid | Clinical Use | Billable? |
|---|---|---|---|---|
| H02.051 | Right | Upper | Right upper lash abrades superior cornea | ✅ |
| H02.052 | Right | Lower | Right lower lash abrades inferior cornea | ✅ |
| H02.053 | Right | Unspecified | Only if documentation omits upper vs. lower | ✅ |
| H02.054 | Left | Upper | Left upper lash abrades superior cornea ← This Code | ✅ |
| H02.055 | Left | Lower | Left lower lash abrades inferior cornea | ✅ |
| H02.056 | Left | Unspecified | Only if documentation omits upper vs. lower | ✅ |
| H02.059 | Unspecified | Unspecified | Documentation deficiency — query first | ✅ ⚠️ |
When Both Left Eyelids Are Affected — Two Codes Required
If documentation describes trichiasis of both the left upper and left lower eyelid, assign H02.054 and H02.055 together. There is no combined “left eye, both lids” code — each affected lid gets its own code. This also applies to four-lid presentations (common in OCP, SJS, trachoma): assign H02.051 + H02.052 + H02.054 + H02.055 together. Under-coding a multi-lid presentation is one of the most common trichiasis completeness failures.
📋 Clinical Overview
Why the Upper Eyelid Has a Distinct Clinical Profile
The upper eyelid has a larger, firmer tarsal plate (approximately 29mm wide × 10-12mm tall) compared to the lower lid, and supports a significantly greater number of lashes — typically 100-150 upper lashes vs. 50-75 lower lashes. This means upper lid trichiasis can involve more individual misdirected lashes, and the mechanical force of the thick superior tarsal plate driving the upper lid down on each blink means upper lid lashes contact the cornea with considerably more force than lower lid lashes.
| Anatomic Feature | Relevance to H02.054 |
|---|---|
| Larger superior tarsal plate | Greater structural mass → more forceful blink contact with cornea |
| Levator palpebrae superioris | Primary lid elevator — levator dysfunction or ptosis may compound trichiasis |
| Müller’s muscle | Sympathetically innervated — ptosis from Müller’s dysfunction can affect lash angle |
| Superior cornea | Contact zone — superior SPK/PEE on fluorescein is the clinical signature of upper lid trichiasis |
| Gray line (mucocutaneous junction) | Surgical landmark for lid-splitting procedures — anterior vs. posterior lamella |
| More lashes than lower lid | Upper lid trichiasis may involve more misdirected lashes → more abrasive corneal contact |
Symptoms — Left Upper Eyelid Trichiasis
| Symptom | Mechanism | Documentation Clue to Look For |
|---|---|---|
| Foreign body sensation | Lash tip contacting superior cornea/conjunctiva with every blink | ”Feels like something in my left eye” |
| Epiphora (tearing) | Reflex lacrimation from superior corneal epithelial irritation | ”Tearing left eye” |
| Photophobia | Corneal epithelial disruption lowers light pain threshold | ”Light sensitivity left eye” |
| Superior conjunctival injection | Mechanical irritation from lash contact with superior bulbar conjunctiva | ”Redness left eye, superior” |
| Superior corneal staining | Punctate epithelial erosions at superior 1/3 cornea | ”SPK superior 1/3 OS” — classic upper lid signature |
| Corneal abrasion | Prolonged or acute lash contact → epithelial defect | ”Corneal abrasion OS” — separately codeable as H16.012 |
| Reflex blepharospasm | Orbicularis spasm from pain/irritation | ”Twitching / squinting left eye” |
| Blurred vision | Tear film disruption; corneal scarring in chronic untreated cases | ”Blurry vision OS” |
| Corneal pannus | Chronic upper lid lash contact → superior vascular ingrowth | ”Superior pannus OS” — late-stage finding |
Superior SPK on Fluorescein = Upper Lid Source
When the slit lamp exam documents “superior SPK grade 2, OS” or “superior corneal staining OS on fluorescein,” that staining distribution points to the upper eyelid as the lash source — supporting H02.054 over H02.055 (lower lid). Inferior SPK points to the lower lid (H02.055). If both superior and inferior SPK are documented, check whether both lids have misdirected lashes — if so, assign both H02.054 and H02.055.
Etiology — Common Causes of Left Upper Eyelid Trichiasis
| Etiology | Notes | Documentation Flag |
|---|---|---|
| Idiopathic / involutional | Isolated follicle misdirection — most common in older adults | ”Misdirected lash(es) left upper lid, no etiology identified” |
| Chronic anterior blepharitis | Lid margin inflammation → follicular scarring → misdirection; often Staph-related | ”Chronic blepharitis OS,” “anterior lid margin disease” |
| Ocular cicatricial pemphigoid (OCP) | Progressive subconjunctival fibrosis — affects all lids; bilateral and progressive | ”OCP,” “mucous membrane pemphigoid” |
| Stevens-Johnson syndrome (SJS) | Acute mucosal sloughing → chronic conjunctival scarring → cicatricial trichiasis all lids | ”SJS sequelae,” “conjunctival scarring OS” |
| Trachoma | Chlamydia trachomatis — leading infectious cause of trichiasis globally; upper lid is the primary trachoma target | ”Trachoma” → dual code A71.x + H02.054 |
| Post-traumatic / chemical burn | Eyelid laceration scar, chemical or thermal injury → distorted follicle growth | ”Post-traumatic,” “alkali burn eyelid OS” |
| Post-surgical | Prior upper lid surgery (ptosis repair, blepharoplasty, upper lid entropion repair) → suture scar misdirects follicles | ”Post-blepharoplasty trichiasis OS” |
| Eyelid margin malignancy | Focal treatment-resistant trichiasis can be a presenting sign of lid margin tumor | ⚠️ Query if new focal trichiasis with adjacent madarosis or visible lid lesion |
| Epiblepharon | Congenital — Excludes1 applies (Q10.3x — NOT H02.054) | “Epiblepharon” = Q10.3x family only |
Trachoma Preferentially Affects the Upper Lid
Unlike most causes of trichiasis, trachoma has a known predilection for the upper eyelid — the superior tarsal conjunctiva is the primary site of Chlamydia trachomatis infection and follicular scarring. When trachoma is the documented etiology, dual-code the trachoma (A71.0 / A71.1 / A71.9) and the trichiasis manifestation (H02.054 for left upper lid). Trachoma is the world’s leading infectious cause of preventable blindness — if it appears in your documentation, every sequela must be captured in full.
Trichiasis vs. Upper Lid Entropion vs. Ptosis — The Left Upper Lid Differential
The left upper lid presents a distinct three-way documentation differential that coders need to triage carefully:
| Condition | Lid Margin Position | Lash Direction | Key Documentation Words | Code |
|---|---|---|---|---|
| Trichiasis w/o entropion | Normal | Inward (focal) | “misdirected lash,” “lash touching cornea,” “ingrowing lash” | H02.054 |
| Entropion | Inverted inward | All inward (lid dragged) | “lid turning in,” “entropion,” “lid inversion” | H02.001 / H02.011 / H02.021 / H02.031 |
| Ptosis with lash contact | Normal — but lid droops low | Lashes may contact cornea due to ptosis positioning | ”ptosis,” “drooping lid OS,” “lid touches cornea due to ptosis” | H02.401-H02.409 range |
| Trichiasis WITH entropion | Inverted | Inward (both) | “entropion with abrading lashes” | Entropion code only — NOT H02.054 |
Entropion + Trichiasis ≠ H02.054
When entropion is the underlying cause of lash misdirection, code the entropion (H02.0xx). H02.054 is exclusively for trichiasis where the lid margin is confirmed to be in a normal position. If the physician notes both an inverted lid and misdirected lashes, the entropion is the primary driver — do not assign H02.054 alongside an entropion code for the same lid.
🔬 Diagnostic Documentation — What Supports H02.054
Slit Lamp Exam Findings
| Finding | Significance for Coding |
|---|---|
| Left upper lid margin in normal position | Confirms “without entropion” qualifier — the key distinguishing finding |
| Lash(es) touching cornea or conjunctiva OS | Core finding — “lash on cornea OS,” “misdirected lash left upper lid” |
| Superior SPK / PEE on fluorescein OS | Corneal evidence of upper lid lash contact — superiorly distributed |
| Normal upper lid eversion exam | No entropion on lid eversion — supports “without entropion” |
| Lash growing posteriorly from normal-position margin | Follicle misdirection visible at slit lamp |
| Madarosis or poliosis in same area | Raises concern for underlying malignancy — note and flag if present |
"Trichiasis Left Eye" Without Lid Specification — Query Before Coding
If documentation only states “trichiasis left eye” without specifying upper or lower lid, do not default to H02.054 or H02.056. As a CIC-trained coder, you know that specificity is non-negotiable. Query the physician first. Check the slit lamp section — superior SPK points to H02.054; inferior SPK points to H02.055. Only use H02.056 (left eye, unspecified) after a failed query attempt.
🛠️ CPT / HCPCS — Treatment Procedures for H02.054
Epilation Codes — Left Upper Eyelid
| CPT | Description | Modifier(s) | When to Use |
|---|---|---|---|
| 67820 | Correction of trichiasis; epilation by forceps only | -LT (left eye); -E1 (left upper lid — per-lid payers) | Mechanical forceps removal — most common first-line office treatment |
| 67825 | Correction of trichiasis; epilation by other than forceps (electrosurgery, cryotherapy, argon/diode laser, radiofrequency) | -LT (left eye); -E1 (left upper lid — per-lid payers) | When lash follicle ablation or destruction is performed to reduce recurrence |
Modifier Strategy — Three Payer Methods
Always Confirm Your MAC/Payer's Billing Method Before Finalizing Modifiers
Per AAPC Ophthalmology Coding Alert, payers reimburse epilation codes using one of three methods:
Payer Method Billing Approach Modifier for Left Upper Lid Per eye One unit per eye treated -LT (left); -RT (right); -50 (bilateral same session) Per eyelid One unit per eyelid treated -E1 (left upper); -E2 (left lower); -E3 (right upper); -E4 (right lower) Per lash One unit per lash removed Rare — verify with payer before billing Use modifier -51 on the second procedure line when treating multiple lids at the same session (e.g., left upper + left lower treated same day).
When Both Left Eyelids Are Treated Same Visit
| Line | CPT | Modifier | Diagnosis |
|---|---|---|---|
| 1 | 67820 | -LT or -E1 | H02.054 (left upper) |
| 2 | 67820 | -51 -E2 (or -51 -LT) | H02.055 (left lower) |
Evaluation and Management — Trichiasis Encounter Codes
| CPT | Description | When to Use |
|---|---|---|
| 92004 | Comprehensive ophthalmologic exam — new patient | New patient presenting with left upper eyelid trichiasis |
| 92014 | Comprehensive ophthalmologic exam — established patient | Follow-up trichiasis management visit |
| 92012 | Intermediate ophthalmologic exam — established patient | Brief lash status check only |
Exam + Epilation on the Same Date — Both Billable
An ophthalmologic exam code (92012, 92014) and an epilation procedure code (67820, 67825) are both billable on the same date of service — the exam is a separately identifiable evaluation from the procedure. No modifier -25 is required on ophthalmologic exam codes (unlike office E/M codes), though some commercial payers may request it. Verify your payer’s policy.
💊 Coding Scenarios
Scenario 1 — Routine Forceps Epilation, Left Upper Eyelid (Outpatient)
Clinical Vignette: A 69-year-old female, established patient, presents for routine follow-up of known trichiasis. Slit lamp: two misdirected lashes, left upper eyelid — both contacting superior corneal surface. Superior SPK grade 1-2 OS on fluorescein. Left upper lid margin in normal anatomic position. Epilation by forceps performed — two lashes removed, left upper eyelid.
CPT / HCPCS:
- 92014 — Comprehensive ophthalmologic exam, established patient
- 67820-LT (or -E1 per-lid payers) — Epilation by forceps, left upper eyelid
ICD-10-CM:
- H02.054 — Trichiasis without entropion, left upper eyelid
Scenario 2 — Argon Laser Epilation Left Upper Eyelid + Corneal Abrasion (Outpatient)
Clinical Vignette: A 63-year-old male presents with acute left eye pain and photophobia × 1 day. Slit lamp: four misdirected lashes, left upper eyelid — one causing a 2.5mm superior corneal abrasion confirmed with fluorescein (NaFl 3+, superior cornea OS). Left upper lid margin in normal position. No entropion. Argon laser epilation performed under topical anesthesia — four lashes, left upper eyelid.
CPT / HCPCS:
- 92014 — Comprehensive ophthalmologic exam, established patient
- 67825-LT (or -E1) — Epilation by argon laser, left upper eyelid
ICD-10-CM:
- H02.054 — Trichiasis without entropion, left upper eyelid (primary — etiology of abrasion)
- H16.012 — Corneal abrasion, left eye (acute epithelial defect — documented and separately codeable)
Sequence H02.054 First — It Is the Cause
The trichiasis is the underlying etiology of the corneal abrasion — sequence H02.054 first. The corneal abrasion (H16.012) is the acute complication that independently affects care at this encounter: antibiotic drops, lubrication, possible patching, pain management. Both codes belong on the claim and neither absorbs the other.
Scenario 3 — Left Upper and Left Lower Lid Trichiasis — Two Codes Required (Outpatient)
Clinical Vignette: A 76-year-old female with chronic blepharitis. Slit lamp: multiple misdirected lashes, left upper and left lower eyelids — superior and inferior SPK OS on fluorescein. Both left lid margins in normal position. Physician performs cryotherapy epilation of both left upper and left lower eyelid lashes same session.
CPT / HCPCS:
- 67825-E1 — Epilation by cryotherapy, left upper eyelid
- 67825-51-E2 — Epilation by cryotherapy, left lower eyelid (multiple procedure, same session)
- 92014 — Comprehensive ophthalmologic exam, established patient
ICD-10-CM:
- H02.054 — Trichiasis without entropion, left upper eyelid
- H02.055 — Trichiasis without entropion, left lower eyelid
Scenario 4 — Bilateral Trichiasis — All Four Lids Affected (Outpatient)
Clinical Vignette: A 53-year-old female with history of ocular cicatricial pemphigoid (OCP). Slit lamp: misdirected lashes present on all four eyelids — superior and inferior SPK bilateral on fluorescein. All four lid margins in normal anatomic position. Electrosurgery epilation performed on all four eyelids same session.
CPT / HCPCS:
- 67825-E3 — Epilation by electrosurgery, right upper eyelid
- 67825-51-E4 — Epilation by electrosurgery, right lower eyelid
- 67825-51-E1 — Epilation by electrosurgery, left upper eyelid
- 67825-51-E2 — Epilation by electrosurgery, left lower eyelid
- 92014 — Comprehensive ophthalmologic exam, established patient
ICD-10-CM:
- H02.051 — Trichiasis without entropion, right upper eyelid
- H02.052 — Trichiasis without entropion, right lower eyelid
- H02.054 — Trichiasis without entropion, left upper eyelid
- H02.055 — Trichiasis without entropion, left lower eyelid
Four Codes for Four Lids — Required and Correct
There is no single ICD-10-CM code for “trichiasis all four eyelids.” Each affected lid requires its own specific code. This is one of the highest-value completeness opportunities in eyelid disorder coding — especially in cicatricial disease patients (OCP, SJS, trachoma) who present with multi-lid involvement at nearly every encounter. Capture every documented lid.
Scenario 5 — Left Upper Eyelid Trichiasis as Additional Diagnosis, Inpatient Admission
Clinical Vignette: A 77-year-old male admitted for vitreoretinal surgery, left eye. H&P documents: “Known trichiasis left upper eyelid — managed with periodic epilation by outpatient ophthalmologist — no trichiasis intervention planned this admission.”
Principal Diagnosis:
- (Retinal/vitreous diagnosis per documentation — reason for admission)
Additional Diagnoses:
- H02.054 — Trichiasis without entropion, left upper eyelid (documented active condition, actively managed — meets UHDDS criteria)
UHDDS Reasoning — Does H02.054 Qualify Here?
Under UHDDS, a condition qualifies as a reportable additional diagnosis when it requires clinical evaluation, therapeutic treatment, diagnostic procedures, extended LOS, or increased nursing/monitoring during the admission. Active trichiasis managed with periodic epilation meets the “therapeutic treatment” threshold even when that treatment occurs outpatient — the physician is documenting active management. If the H&P is sparse and only mentions it in passing with no management statement, a query is appropriate before assigning.
⚠️ Coding Pitfalls and Tips
| Pitfall or Tip | |
|---|---|
| ❌ | Never assign H02.054 when left upper entropion is present — inverted left upper lid = H02.001/H02.011/H02.021/H02.031; H02.054 is explicitly “without entropion” |
| ❌ | Never default to H02.056 (left eye, unspecified) when documentation states upper lid — always code to highest specificity when documented |
| ❌ | Never omit -LT or -E1 modifier on 67820/67825 for left upper lid — a laterality mismatch between diagnosis (left) and modifier (right) is a claim denial and audit trigger |
| ❌ | Never use H02.054 for congenital trichiasis / epiblepharon / distichiasis — Excludes1 at H02 blocks use with Q10.0-Q10.3 |
| ❌ | Never code just one lid when documentation describes multiple lids — each affected lid gets its own code |
| ✅ | Superior SPK OS = left upper lid source — use the corneal staining pattern to confirm lid specificity before coding |
| ✅ | Match your modifiers to your diagnosis — H02.054 (left) must pair with -LT or -E1; never -RT or -E3 |
| ✅ | Check the fellow right upper lid — bilateral upper lid trichiasis is common; if H02.051 also applies, assign both |
| ✅ | Check the left lower lid — combined left upper + left lower trichiasis (H02.054 + H02.055) is common, especially in blepharitis and cicatricial disease |
| ✅ | Code corneal abrasion separately — H16.012 (left eye) when a misdirected lash creates a documented epithelial defect |
| ✅ | Code dry eye separately — H04.122 (dry eye, left lacrimal gland) when co-existing dry eye is documented |
| ✅ | Trachoma preferentially affects the upper lid — when trachoma is documented, dual-code A71.x alongside H02.054 |
| ✅ | Watch for eyelid margin malignancy — new focal treatment-resistant left upper lid trichiasis with adjacent madarosis or a visible lid lesion warrants clinical documentation review and possible query |
| ✅ | The treatment CPT is your fastest clue — physician billing 67820 or 67825 with -LT = you are in the H02.054/H02.055/H02.056 code range |
🔗 Related ICD-10-CM Codes
H02.05x — Complete Trichiasis Without Entropion Family
| Code | Description | Billable? |
|---|---|---|
| H02.05 | Trichiasis without entropion (header) | ❌ Non-billable |
| H02.051 | Right upper eyelid | ✅ |
| H02.052 | Right lower eyelid | ✅ |
| H02.053 | Right eye, unspecified eyelid | ✅ (only if lid not documented) |
| H02.054 | Left upper eyelid ← This Code | ✅ |
| H02.055 | Left lower eyelid | ✅ |
| H02.056 | Left eye, unspecified eyelid | ✅ (only if lid not documented) |
| H02.059 | Unspecified eye, unspecified eyelid ⚠️ | ✅ (last resort) |
Left Upper Eyelid Disorders — Differential Coding Reference
| Code | Description | Key Distinguishing Feature |
|---|---|---|
| H02.054 | Trichiasis w/o entropion, left upper ← This code | Normal lid margin position; lashes misdirected |
| H02.001 | Unspecified entropion, left upper eyelid | Lid margin inverted — unspecified type |
| H02.011 | Cicatricial entropion, left upper eyelid | Lid inversion from scarring |
| H02.021 | Mechanical entropion, left upper eyelid | Lid inversion from mechanical cause |
| H02.031 | Senile entropion, left upper eyelid | Age-related lid inversion |
| H02.401 | Unspecified ptosis, left eyelid | Upper lid drooping — separate from trichiasis |
| H02.411 | Mechanical ptosis, left eyelid | Ptosis from lid mass or scarring |
| H02.421 | Myogenic ptosis, left eyelid | Ptosis from muscle/neuromuscular disease |
Concurrent / Comorbid Codes — Co-Code When Documented
| Code | Description | Co-Code When |
|---|---|---|
| H16.012 | Corneal abrasion, left eye | Documented epithelial defect from misdirected lash |
| H16.142 | Punctate keratitis, left eye | Superior SPK documented on fluorescein OS |
| H04.122 | Dry eye syndrome, left lacrimal gland | Co-existing dry eye documented |
| H10.812 | Conjunctivitis, left eye (other) | Documented conjunctival inflammation from lash irritation |
| H02.055 | Trichiasis w/o entropion, left lower eyelid | Left lower lid also affected |
| H02.051 | Trichiasis w/o entropion, right upper eyelid | Right upper lid also affected (bilateral upper) |
| H02.052 | Trichiasis w/o entropion, right lower eyelid | Right lower lid also affected (four-lid presentation) |
| A71.9 | Trachoma, unspecified | Trachoma documented as etiology |
📚 Sources
1. AAPC Codify. “ICD-10 Code H02.054 — Trichiasis without entropion, left upper eyelid.” Valid and billable FY2026.
2. AAPC Codify. “ICD-10 Code H02.05 — Trichiasis without entropion.” Full subcategory listing H02.051-H02.059; Excludes1 for Q10.0-Q10.3 at H02 category level.
3. Unbound Medicine ICD-10-CM. “H02.05 — Trichiasis without entropion.” Code family hierarchy and billable/non-billable distinctions confirmed.
4. AAPC Ophthalmology Coding Alert. “Code Epilation for Trichiasis.” CPT 67820/67825 per-eye, per-lid, per-lash billing methodologies; modifier -51 for multiple lids same session; -LT/-RT/-E1-E4 modifier strategy.
5. AAPC Ophthalmology Coding Alert. “Avoid Irritation While Coding Epilation for Trichiasis.” Modifier -E1 (upper left), -E2 (lower left), -E3 (upper right), -E4 (lower right) definitions; multiple-procedure indicator on 67820/67825.
6. MD Clarity. “CPT Code 67820: What It Is, Modifiers, Reimbursement.” -LT/-RT/-E1-E4 applicability; per-lid vs. per-eye billing documentation.
7. EyeWiki AAO. “Trichiasis.” Upper lid trachoma predilection; superior SPK as upper lid contact signature; cicatricial vs. idiopathic etiology spectrum; malignancy as masquerade condition.
8. Merck Manual Professional Edition. “Trichiasis — Eyelid and Lacrimal Disorders.” Clinical distinction from entropion; fluorescein evaluation; corneal ulceration risk in chronic untreated cases. Updated January 2026.
9. Review of Ophthalmology. “Trichiasis: Lashes Gone Astray.” Cicatricial trichiasis etiology; OCP/SJS/trachoma clinical contexts; upper vs. lower lid anatomical and treatment distinctions.
10. All About Vision. “Superficial Punctate Keratitis.” SPK distribution correlation to trichiasis source — superior SPK = upper lid lash contact; inferior SPK = lower lid.