Crystal's MCW Coder Hub🧬 ICD-10 CM H40.61X4 — Glaucoma Secondary to Drugs, Right Eye, Indeterminate Stage
Billable Code Confirmed — 7 Characters Complete
Non-Billable Parent Codes — Do Not Submit
- ❌
H40.61— 5-character header — non-billable- ❌
H40.6— 4-character header — non-billable
🚨 MANDATORY ADDITIONAL CODE — T-Code Required
Cross-Reference
For full pathophysiology, T-code mechanics, steroid background, and CPT templates → see H40.61X1. This note focuses entirely on the indeterminate stage — what it means, when it applies, and how it differs from unspecified.
🔍 Code Description
H40.61X4 classifies glaucoma secondary to drug therapy, right eye, at the indeterminate stage — a stage designation assigned when the diagnosis of glaucoma is clinically established but the severity cannot be determined because visual field testing has not been performed, could not be completed, or produced unreliable/uninterpretable results. The glaucoma is real — confirmed by optic nerve examination and/or RNFL OCT findings consistent with glaucomatous damage. The stage is simply beyond the reach of current testing.
This is a legitimate, clinically valid stage — not a coding failure or documentation gap. The physician’s documented reason for inability to stage is what separates H40.61X4 from H40.61X0 (stage unspecified). When a cataract clouds the view, when a patient cannot cooperate with the visual field machine, or when glaucoma is newly diagnosed and testing is pending — indeterminate is the correct and honest answer.
🔑 The Single Most Important Concept — Indeterminate ≠ Unspecified
This distinction is the entire clinical and coding value of H40.61X4, and it is tested on the CIC/COC/CPC exams.
4 vs. 0 — Know the Difference Cold
| 7th Character | Code | Meaning | When to Use | CDI Action |
|---|---|---|---|---|
| 4 | H40.61X4 | Glaucoma confirmed — stage CANNOT be determined — clinical barrier exists | Media opacity, unreliable VF, VF not yet performed, patient incapable | ✅ Use — document the reason |
| 0 | H40.61X0 | Glaucoma confirmed — stage simply NOT documented | Documentation gap — physician didn’t record stage | ⚠️ Last resort — CDI query first |
Think of It This Way
Indeterminate (4) = “I looked, I tried, I can’t tell because of [documented reason]” Unspecified (0) = “Nobody wrote it down”
One is a clinical answer. The other is a documentation gap. H40.61X4 is the correct code when the physician documents WHY staging is not possible.
📊 When Does Indeterminate Stage Apply?
These are the four clinical scenarios where H40.61X4 is appropriate:
Scenario Type 1 — Media Opacity Prevents Visual Field Testing
| Media Opacity | Effect on Staging |
|---|---|
| Dense cataract | Most common cause — lens opacity reduces retinal illumination, producing an unreliable or severely depressed visual field that does not reflect true glaucomatous loss |
| Corneal opacity/scar | Reduces light transmission; distorts field testing results |
| Vitreous hemorrhage | Blocks view; field testing unreliable until hemorrhage clears |
| Poorly dilating pupil | Miotic pupil (Horner’s, pilocarpine use) artificially depresses visual field |
The Dense Cataract + Glaucoma Dilemma — A Classic H40.61X4 Scenario
This is the most common real-world trigger for H40.61X4. A patient has documented glaucomatous optic nerve cupping and elevated IOP — confirmed glaucoma — but a dense posterior subcapsular cataract (coincidentally, often steroid-induced H26.13 — connecting directly back to H40.61X1-4!) depresses the entire visual field, making it impossible to distinguish:
- True glaucomatous field loss from cataract-induced depression
- The actual severity of the glaucoma
The ophthalmologist cannot reliably stage the glaucoma until the cataract is removed. Until then → H40.61X4. After cataract surgery with a reliable post-op visual field → re-stage to H40.61X1, H40.61X2, or H40.61X3.
This is where your steroid glaucoma (H40.61X4) and steroid cataract (H26.13) notes connect: the same steroid that caused the glaucoma often causes the PSC cataract that prevents staging it. Document both.
Scenario Type 2 — Unreliable Visual Field Results
A visual field is performed but the reliability indices are outside acceptable parameters, making the results uninterpretable:
| Reliability Issue | HVF Indicator | Impact |
|---|---|---|
| High fixation losses | >20% fixation loss rate | Patient not maintaining fixation — field unreliable |
| High false positive rate | >15% false positives | ”Trigger happy” responses — artificially good-looking field |
| High false negative rate | >33% false negatives | Inattentive responses — artificially depressed field |
| Short-term fluctuation | Excessive SF on STATPAC | Highly variable responses within the test |
Unreliable ≠ Failed — Document the Indices
When a visual field is performed but is unreliable, the physician note should document the reliability issue: “Visual field today unreliable — high fixation loss rate of 35% — cannot stage glaucoma based on today’s testing.” This documentation supports H40.61X4 and protects against audit challenge.
Scenario Type 3 — Patient Incapable of Performing Visual Field
Some patients simply cannot perform reliable perimetry regardless of how many attempts are made:
| Patient Limitation | Clinical Context |
|---|---|
| Cognitive impairment / dementia | Cannot follow instructions reliably |
| Severe tremor or movement disorder | Parkinson’s, MS — fixation impossible |
| Language barrier without interpreter | Cannot understand the task |
| Severe anxiety or claustrophobia | Cannot maintain position in perimeter |
| Physical disability preventing positioning | Wheelchair/positioning challenge |
| Pediatric / very young patient | Too young for reliable threshold perimetry |
Scenario Type 4 — Visual Field Not Yet Performed (Newly Diagnosed)
When glaucoma is newly diagnosed at an encounter and visual field testing has been ordered but not yet completed — the stage is genuinely not yet determinable.
Newly Diagnosed — Use Indeterminate Temporarily, Not Permanently
H40.61X4 is an appropriate interim code for a newly diagnosed patient whose visual field is pending. Once the visual field is completed and reliable, re-stage to H40.61X1, H40.61X2, or H40.61X3 at the next encounter. Do not keep H40.61X4 permanently when staging becomes possible — update the code to reflect the confirmed stage.
🌳 The Complete H40.61X Family — Finished! ✅
H40.61 Right Eye — Glaucoma Secondary to Drugs ❌ Non-billable
│ [T-code required at all stages]
│
├── H40.61X0 Unspecified ⚠️ Documentation gap → CDI query
│ "Nobody wrote it down"
│
├── H40.61X1 Mild MD > -6 dB | Early field loss
│
├── H40.61X2 Moderate MD -6 to -12 dB | Significant loss, fixation intact
│
├── H40.61X3 Severe MD < -12 dB OR within 5° of fixation
│ Surgical urgency
│
└── H40.61X4 Indeterminate ← THIS CODE ✅
"I tried — I can't tell — here's why"
Media opacity | Unreliable VF | Can't perform VF | Pending VF
🔬 What the Physician Note Must Contain to Support H40.61X4
Unlike staged glaucoma codes which are supported by HVF mean deviation values, H40.61X4 is supported by documentation of the barrier to staging:
| Required Documentation Element | Example Language |
|---|---|
| Glaucoma confirmed | ”Glaucomatous optic nerve cupping OD, confirmed on OCT RNFL” |
| Drug cause documented | ”IOP elevation and glaucoma secondary to intravitreal triamcinolone” |
| Staging barrier documented | ”Visual field testing not reliable today due to dense PSC OD — cannot stage” |
| Plan to re-stage | ”Will re-evaluate glaucoma stage after cataract surgery OD” |
The OCT Is the Anchor at Indeterminate Stage
When visual field testing is unavailable or unreliable, OCT RNFL analysis (92133) becomes the primary structural documentation tool for H40.61X4. The OCT can confirm glaucomatous RNFL thinning — establishing the diagnosis — even when the VF cannot establish the stage. Document the OCT findings explicitly: “OCT RNFL OD: moderate superior and inferior thinning consistent with glaucoma — confirms diagnosis despite unreliable VF.”
🔗 Related ICD-10-CM Codes
H40.61X Family — Complete Right Eye Map
| Code | Stage | Criteria | Status |
|---|---|---|---|
| H40.61X0 | Unspecified | Not documented | ⚠️ CDI query |
| H40.61X1 | Mild | MD > -6 dB | ✅ |
| H40.61X2 | Moderate | MD -6 to -12 dB | ✅ |
| H40.61X3 | Severe | MD < -12 dB or 5° of fixation | ✅ |
| H40.61X4 | Indeterminate | Cannot stage — reason documented | ✅ This Code |
Cross-Laterality
| Code | Description |
|---|---|
| H40.62X4 | Glaucoma secondary to drugs, left eye, indeterminate |
| H40.63X4 | Glaucoma secondary to drugs, bilateral, indeterminate |
Mandatory Additional Code
| Code | Use When |
|---|---|
| T38.0X5A | First encounter documenting indeterminate stage |
| T38.0X5D | All ongoing visits ← Most common |
Commonly Co-Coded with H40.61X4
| Code | Description | Connection |
|---|---|---|
| H26.13 | Posterior subcapsular cataract | Most common cause of indeterminate staging — steroid PSC preventing reliable VF |
| H26.9 | Cataract, unspecified | When type not specified |
| H43.1x | Vitreous hemorrhage | Blood preventing VF testing |
| Z79.52 | Long-term systemic steroid use | Chronic exposure documentation |
| H35.3221 | Wet AMD, right eye, active CNV | If Ozurdex caused the SIG |
| E11.3511 | T2DM with DME right eye | If Ozurdex for DME caused SIG |
🛠️ CPT Templates at Indeterminate Stage
Template A: Indeterminate Due to Dense Cataract — OCT Only Visit
| Code | Description | Notes |
|---|---|---|
| 92014 | Comprehensive exam, established | Full glaucoma + cataract evaluation |
| 92133-RT | OCT optic nerve/RNFL, right eye | Structural staging substitute — VF unreliable |
| 92083-RT | HVF 24-2 attempted | Bill even if unreliable — document reliability indices |
| H40.61X4 | Primary Dx | Indeterminate — PSC prevents staging |
| T38.0X5D | Required additional | |
| H26.13 | Additional Dx | Posterior subcapsular cataract — the staging barrier |
Bill the Attempted Visual Field Even If Unreliable
When a visual field is performed but produces unreliable results, 92083 is still billable — the test was performed and the technician’s time was used. Document the reliability indices in the report and the physician’s assessment of why the field is not interpretable. Do not avoid billing the test because it was unreliable — the attempt itself has clinical and billing validity.
Template B: Newly Diagnosed Indeterminate — Pending VF
| Code | Description | Notes |
|---|---|---|
| 92004 or 92014 | Comprehensive exam | New vs. established |
| 92133-RT | OCT optic nerve/RNFL | Structural diagnosis confirmation |
| H40.61X4 | Primary Dx | Newly diagnosed — VF ordered but pending |
| T38.0X5A | Required additional | Initial encounter — first diagnosis |
Template C: Post-Cataract Surgery Re-Staging (Code Change Visit)
After cataract removal, reliable visual field testing becomes possible. This is the transition visit from H40.61X4 → staged code.
| Code | Description | Notes |
|---|---|---|
| 92014 | Established exam | Post-cataract glaucoma reassessment |
| 92083-RT | HVF 24-2 SITA Standard | Now reliable post-cataract — stages the glaucoma |
| 92133-RT | OCT RNFL | Structural comparison |
| H40.61X1/2/3 | New primary Dx | Re-staged based on reliable post-op VF |
| T38.0X5D | Required additional | Continues — drug cause unchanged |
The Post-Cataract Code Change — From H40.61X4 to a Staged Code
When cataract surgery restores a clear optical path and reliable visual fields become obtainable, H40.61X4 should be retired and replaced with the appropriate staged code at the first post-op visit where a reliable HVF is documented. This is not an optional update — the indeterminate stage was always temporary pending reliable testing, and accuracy requires updating the code once staging is possible. Document the re-staging explicitly: “Post-cataract VF now reliable — MD -7.2 dB — reclassifying to moderate stage.”
💊 Coding Scenarios
Scenario 1 — Steroid PSC Causing Indeterminate Stage (Classic)
Clinical Vignette: A 64-year-old male with steroid-induced glaucoma OD from long-term inhaled fluticasone presents for monitoring. OCT RNFL OD: moderate superior thinning. HVF 24-2 OD attempted — reliability indices: fixation losses 28%, false negatives 42% — “unreliable — cannot interpret.” Dense PSC OD also present. Physician note: “Cannot stage glaucoma OD today — visual field unreliable due to dense PSC. Planning cataract surgery OD next month. Will re-stage post-operatively.”
ICD-10-CM:
- H40.61X4 — Glaucoma secondary to drugs, right eye, indeterminate (confirmed glaucoma; cannot stage due to PSC/unreliable VF — documented reason present)
- T38.0X5D — Adverse effect of glucocorticoids, subsequent encounter
- H26.13 — Posterior subcapsular cataract (steroid-induced PSC — the barrier to staging)
Two Steroid Complications, One Patient, Same Cause
This scenario perfectly illustrates the steroid complication cascade: the same inhaled fluticasone caused both the glaucoma (H40.61X4) and the PSC cataract (H26.13) — and the cataract is now preventing accurate staging of the glaucoma. Both codes belong on the same claim, both pointing back to the same T38.0X5D adverse effect code. Crystal, this trifecta is a high-yield scenario for the CIC exam.
Scenario 2 — Newly Diagnosed, VF Pending (Indeterminate → Staged Transition)
Visit 1: A 58-year-old female on chronic prednisolone for lupus presents for routine eye exam. IOP OD: 34 mmHg. Optic nerve OD: C/D ratio 0.8, rim thinning superior and inferior. OCT RNFL OD: significant superior and inferior thinning. Physician: “New diagnosis of steroid-induced glaucoma OD. Visual field ordered — appointment scheduled for next week. Cannot stage at this time.”
Visit 1 ICD-10-CM:
- H40.61X4 — Indeterminate (newly diagnosed; VF pending)
- T38.0X5A — Initial encounter (first visit for this diagnosis)
- M32.9 — SLE (reason prednisolone was prescribed)
Visit 2 (1 week later): HVF 24-2 OD: reliable (FL 8%, FP 3%, FN 12%). MD -9.4 dB. Pattern deviation: superior and inferior arcuate defects, not within 5° of fixation. Physician: “Moderate drug-induced glaucoma OD — MD -9.4 dB — starting latanoprost.”
Visit 2 ICD-10-CM — Stage Updated:
- H40.61X2 — Moderate stage (MD -9.4 dB = moderate; H40.61X4 retired — staging now possible)
- T38.0X5D — Subsequent encounter (now follow-up)
- M32.9 — SLE
Scenario 3 — Cognitively Impaired Patient, Cannot Perform VF
Clinical Vignette: An 84-year-old female with moderate dementia and known drug-induced glaucoma OD from chronic ophthalmic steroid use is brought in by her daughter. IOP OD: 26 mmHg on latanoprost + timolol. OCT RNFL OD: advanced superior and inferior thinning. Visual field attempted — patient cannot follow instructions — test aborted after 3 attempts. Physician: “Unable to perform reliable visual field today due to moderate dementia — cannot stage. OCT suggests possible severe damage. Continue current drops, add brimonidine.”
ICD-10-CM:
- H40.61X4 — Indeterminate (dementia prevents reliable VF — cannot stage despite attempts; OCT findings suggest possible severity but HVF criteria required for staging)
- T38.0X5D — Adverse effect of glucocorticoids, subsequent encounter
- F02.80 — Dementia in other diseases, without behavioral disturbance (underlying condition preventing staging)
OCT Alone Does NOT Establish Stage — HVF Required
Even though the OCT in this scenario “suggests possible severe damage,” ICD-10-CM glaucoma staging requires visual field criteria (Hodapp-Parrish-Anderson / HPA criteria based on HVF mean deviation). [web:244][web:247] OCT structural data alone — without a reliable HVF — supports the diagnosis but does not establish the stage. The physician correctly codes indeterminate (H40.61X4) rather than assuming severe based on OCT alone. When the visual field is not obtainable, the stage is indeterminate — period.
⚠️ Full H40.61X Family — Final Comparison Table
| H40.61X0 | H40.61X1 | H40.61X2 | H40.61X3 | H40.61X4 | |
|---|---|---|---|---|---|
| Stage | Unspecified | Mild | Moderate | Severe | Indeterminate |
| MD | Not documented | > -6 dB | -6 to -12 dB | < -12 dB | Cannot determine |
| Use when | Last resort ⚠️ | VF reliable; early loss | VF reliable; mod loss | VF reliable; advanced | Clinical barrier to staging |
| T-code | T38.0X5x ✅ | T38.0X5x ✅ | T38.0X5x ✅ | T38.0X5x ✅ | T38.0X5x ✅ |
| CDI action | Query stage | None needed | None needed | None needed | Document reason |
| OCT coverage | ✅ | ✅ | ✅ | ✅ [web:54] | ✅ |
| Temporary? | Ideally | No | No | No | Often — re-stage when possible |
⚠️ Coding Pitfalls and Tips
| Pitfall or Tip | |
|---|---|
| ❌ | Never submit H40.61X4 without T38.0X5x T-code — mandatory |
| ❌ | Never use H40.61X4 as a permanent default — it is appropriate temporarily; update to a staged code when reliable VF becomes possible |
| ❌ | Never use H40.61X4 interchangeably with H40.61X0 — indeterminate has a documented clinical reason; unspecified is a documentation gap |
| ❌ | Never stage glaucoma from OCT alone — HVF mean deviation drives stage assignment; OCT supports the diagnosis but not the stage |
| ❌ | Never skip billing 92083 because the VF was unreliable — the test was performed; bill it and document the unreliability |
| ✅ | H40.61X4 = confirmed glaucoma + documented barrier to staging — the diagnosis is NOT in question; only the severity |
| ✅ | Document the specific barrier — “dense PSC,” “unreliable VF (FL 28%),” “patient unable to cooperate due to dementia,” “VF pending” |
| ✅ | Plan to re-stage is good practice — “will re-stage after cataract surgery” shows clinical intent and supports record continuity |
| ✅ | OCT (92133) is the anchor at indeterminate stage — structural evidence of glaucoma when VF is unavailable |
| ✅ | Steroid PSC + H40.61X4 is a classic trifecta — same drug causes glaucoma AND the cataract preventing staging; code all three |
| ✅ | H40.61X4 confirmed on CMS LCD A56916 as covered Dx for 92133 — OCT billing supported at indeterminate stage |
| ✅ | RT modifier on all unilateral right-eye CPT codes |
| ✅ | T38.0X5A at first indeterminate encounter; T38.0X5D at all follow-up visits |
📚 Sources
1. CMS LCD Article A56916 — Scanning Computerized Ophthalmic Diagnostic Imaging (SCODI). Full H40.61X family confirmed — H40.61X0 through H40.61X4 listed as covered diagnoses for CPT 92133 (OCT optic nerve/RNFL). Revised December 2024. [web:54]
2. Unbound Medicine ICD-10-CM. “H40.61X4 — Glaucoma secondary to drugs, right eye [indeterminate stage].” Code confirmed. [web:242]
3. Coding Billing Solutions. “Glaucoma ICD-10 Codes.” Full H40.61X family structure confirmed — X placeholder + stage digit; H40.61X4 indeterminate confirmed in family listing. [web:199]
4. AAPC. ICD-10-CM Code H40.61 — Glaucoma secondary to drugs, right eye. T-code use additional code instruction confirmed. [web:207]
5. Ophthalmology Management. “ICD-10 Comes to Glaucoma.” Indeterminate stage (7th digit “4”) defined: “Either the doctor cannot determine the nature of the visual field loss, or the patient has not been tested yet, or the patient performed very poorly on the visual field test so the physician cannot rely on the test results to arrive at a diagnosis.” — Dr. Cynthia Mattox, New England Eye Center; Kevin Corcoran, CPC. [web:244]
6. Eyes on Eyecare. “12 Different Glaucoma ICD-10 Codes — How and When to Use Them.” Staging digit 4 = indeterminate stage confirmed. [web:246]
7. Glaucoma Today / BMC Today. “ICD-10-CM for Glaucomatologists.” Dr. Cynthia Mattox, AGS Patient Care Committee. Indeterminate stage: “visual fields not performed yet, patient incapable of visual field testing, or unreliable/uninterpretable visual field testing.” [web:247]
8. See H40.61X1 for full citation list covering pathophysiology, T-code adverse effect framework, and steroid-induced glaucoma clinical background.