🧬 ICD-10 CM H11.433 — Conjunctival Hyperemia, Bilateral
Billable Code Confirmed
ICD-10 CM H11.433 is a complete 6-character code with laterality character “3” designating bilateral involvement, meeting full specificity requirements for both eyes. No further extension or additional character is required, making it valid for reimbursement on all HIPAA-covered inpatient and outpatient claims.³
Non-Billable Parent Codes
H11.43 Conjunctival hyperemia (parent) is non-billable because it lacks the required 6th character identifying laterality — right, left, bilateral, or unspecified — and cannot be submitted on its own. H11.4 Other conjunctival vascular disorders and cysts is a broader non-billable category header that groups vascular abnormalities, edema, hyperemia, and cysts together without specifying which condition or eye is affected. H11 Other disorders of conjunctiva is the top-level non-billable category encompassing pterygium, conjunctival degenerations, vascular disorders, cysts, and other specified/unspecified conjunctival conditions.
Clinical Context
The clinical distinction driving selection of H11.433 over its siblings is bilaterality — both eyes must be documented as affected by the redness/injection, distinguishing it from unilateral presentations that would map to right or left eye-specific codes.
Code Classification
This is a diagnosis code (ICD-10-CM), not a procedure code. It documents a clinical sign/finding rather than a definitive disease process, and is most often used as a secondary or symptom code rather than principal diagnosis.
🔍 Code Description
Conjunctival hyperemia refers to visible dilation and engorgement of the small blood vessels within the bulbar and/or palpebral conjunctiva, producing the clinical appearance commonly called “red eye” or “bloodshot eye.” H11.433 specifically documents this finding as bilateral, meaning both the right and left conjunctiva show vascular injection on examination. Unlike conjunctivitis, this code does not presume an infectious or inflammatory diagnosis — it is a descriptive sign code used when hyperemia is documented as an isolated or nonspecific finding, separate from a confirmed underlying condition.
This code sits within the H11.4 subcategory alongside other conjunctival vascular and cystic findings such as H11.419 vascular abnormalities and H11.449 conjunctival cysts, reflecting ICD-10-CM’s granular approach to conjunctival pathology. In inpatient coding, H11.433 frequently surfaces in postoperative ophthalmic notes, ICU nursing documentation of ocular irritation, or as an incidental finding during a general physical exam unrelated to the primary reason for admission. Because it does not carry CC/MCC weight or HCC mapping, its coding value lies mainly in supporting a complete clinical picture and prompting queries when a more specific etiology is suspected but undocumented.
🌳 Code Tree / Hierarchy
H11 Other disorders of conjunctiva ❌ Non-billable
│
├── H11.0- Pterygium of eye ❌ Non-billable (category)
├── H11.1- Conjunctival degenerations and deposits ❌ Non-billable (category)
│
├── H11.4 Other conjunctival vascular disorders and cysts ❌ Non-billable
│ │
│ ├── H11.41- Vascular abnormalities of conjunctiva ❌ Non-billable
│ ├── H11.42- Conjunctival edema ❌ Non-billable
│ │
│ ├── H11.43 Conjunctival hyperemia ❌ Non-billable
│ │ │
│ │ ├── [[H11.431]] Conjunctival hyperemia, right eye ✅ Billable
│ │ ├── [[H11.432]] Conjunctival hyperemia, left eye ✅ Billable
│ │ ├── H11.433 Conjunctival hyperemia, bilateral ◀ THIS CODE ✅ Billable
│ │ └── [[H11.439]] Conjunctival hyperemia, unspecified eye ✅ Billable
│ │
│ └── H11.44- Conjunctival cysts ❌ Non-billable (category)
│
└── H11.8- Other specified disorders of conjunctiva ❌ Non-billable (category)
Bilateral Specificity Matters
Tip
Always confirm whether the hyperemia is an isolated finding versus a documented symptom of conjunctivitis, allergic reaction, dry eye, or postoperative inflammation — if an underlying diagnosis is confirmed, that condition should typically be the primary code with H11.433 used only as an additional descriptive code if separately relevant.
✅ Includes
- Bilateral red eye — visible redness affecting both eyes on clinical exam, documented without a confirmed infectious or allergic diagnosis.
- Bilateral conjunctival injection — engorged/dilated conjunctival vessels noted bilaterally, a common finding in ICU and post-anesthesia documentation.
- Nonspecific bilateral ocular redness — used when hyperemia is the only documented finding and no further etiology workup has been completed at time of coding.
❌ Excludes
Excludes 1
Danger
H16.23 Keratoconjunctivitis, bilateral cannot be coded together with H11.433 — keratoconjunctivitis is a distinct inflammatory disease process involving both the cornea and conjunctiva, and coding both simultaneously would be redundant since the hyperemia is inherent to the keratoconjunctivitis diagnosis itself. The most common Excludes1 error is coders adding H11.433 as a “supporting” code when a physician has already documented keratoconjunctivitis, not realizing the hyperemia is already captured within that more specific diagnosis.
Excludes 2
None specified for this code.
📋 Clinical Overview
Isolated Hyperemia vs. Documented Conjunctivitis
Distinguishing simple bilateral hyperemia from a confirmed conjunctivitis diagnosis is the central CDI challenge with this code family. The table below compares H11.433 against its closest clinical mimics to clarify when each applies.
| Feature | H11.433 | H10.33 Unspecified Acute Conjunctivitis, Bilateral | H10.13 Acute Atopic Conjunctivitis, Bilateral |
|---|---|---|---|
| Etiology Confirmed | No — isolated sign/finding only, no infectious or allergic cause documented. | Yes — presumed infectious/inflammatory process, though organism may be unspecified. | Yes — allergic/atopic mechanism specifically documented. |
| Associated Symptoms | May be asymptomatic or accompany mild irritation; discharge, itching, and discomfort are not implied by the code itself. | Typically includes mucopurulent or watery discharge, gritty sensation, and possible photophobia. | Itching is the hallmark symptom, often with tearing, lid edema, and seasonal or allergen-triggered pattern. |
| Typical Clinical Setting | Postoperative notes, ICU/general exam findings, incidental documentation unrelated to primary admission diagnosis. | Ophthalmology or ED visits for acute red eye with discharge; may prompt culture or empiric antibiotic therapy. | Allergy/immunology or ophthalmology visits, often with a known allergen trigger or seasonal history. |
Important
If a CDI review finds “conjunctival hyperemia” documented alongside descriptors like “purulent drainage,” “itching,” or “photophobia” without a formal diagnosis label, a query is warranted to clarify whether conjunctivitis (infectious or allergic) should be coded instead of the nonspecific hyperemia sign code.
Manifestations & Symptom Burden
- Visible redness — dilated, engorged conjunctival vessels visible on external exam, the defining feature of this code.
- Mild irritation or foreign body sensation — patients may report gritty or scratchy discomfort without significant pain.
- Watering (epiphora) — reflexive tearing can accompany hyperemia even without infection.
- Photophobia — mild light sensitivity may be present, particularly if hyperemia follows ocular surgery or trauma.
- Asymptomatic incidental finding — in inpatient settings, hyperemia is often noted on routine exam without patient-reported symptoms.
Tip
When hyperemia is documented purely as an incidental exam finding with no patient complaint or treatment ordered, confirm with the provider whether it warrants a distinct code at all versus being folded into a general “b” note — over-coding minor incidental findings can b chart complexity without clinical value.
💰 HCC Risk Adjustment
| Model Version | HCC Mapping |
|---|---|
| CMS-HCC V24 | Not Mapped |
| CMS-HCC V28 | Not Mapped |
| RxHCC | Not Mapped |
ICD-10 CM H11.433 has zero RAF impact under any current CMS risk adjustment model. It is a sign/symptom code representing a nonspecific clinical finding rather than a chronic condition category, so HCC capture strategies should focus instead on any confirmed underlying diagnosis (e.g., glaucoma, uveitis, diabetic eye disease) if present. Coders should not treat this code as an HCC-capture opportunity during annual wellness visit or risk-adjustment-focused chart reviews.
🏥 MS-DRG Assignment
| DRG | Title | CC/MCC Tier |
|---|---|---|
| 124 | Other Disorders of the Eye | With MCC |
| 125 | Other Disorders of the Eye | Without MCC |
ICD-10 CM H11.433 groups to MDC 02 (Diseases and Disorders of the Eye), DRG 124/125, which has a simplified two-tier structure without a distinct CC-only DRG.² Since H11.433 itself is not designated as a CC or MCC, it does not independently influence DRG weight or reimbursement — the DRG tier is instead driven by whatever other diagnoses are present on the claim. As a secondary diagnosis, its main coding value is completeness of documentation rather than financial impact; it would be unusual, though not impossible, for this code to serve as principal diagnosis on an inpatient claim, since bilateral hyperemia alone rarely justifies inpatient-level care.
🔗 Related ICD-10-CM Codes
Same H11.43 Subcategory (Laterality Variants):
- H11.431 — Conjunctival hyperemia, right eye
- H11.432 — Conjunctival hyperemia, left eye
- H11.439 — Conjunctival hyperemia, unspecified eye
Related Conjunctival/Ocular Surface Conditions:
- H10.33 — Unspecified acute conjunctivitis, bilateral
- H10.13 — Acute atopic conjunctivitis, bilateral
- H11.821 — Conjunctivochalasis, right eye
- H11.823 — Conjunctivochalasis, bilateral
- H16.239 — Keratoconjunctivitis, unspecified, unspecified eye
🛠️ Commonly Associated CPT Codes
- 92002 — Ophthalmological services, new patient, intermediate exam. Commonly billed when hyperemia is the presenting complaint at an initial ophthalmology visit, bundled with the E/M-equivalent eye exam service rather than billed separately from the diagnosis.
- 92012 — Ophthalmological services, established patient, intermediate exam. Used for follow-up visits monitoring resolution of hyperemia, particularly postoperative or post-treatment rechecks.
- 92285 — External ocular photography. May be used to document and track bilateral hyperemia over time, especially in cases with an unclear or evolving etiology.
- 65205 — Removal of foreign body, external eye, conjunctival superficial. Relevant if hyperemia is secondary to a foreign body irritant requiring removal.
- 92018 — Comprehensive ophthalmological exam under general anesthesia, applicable in pediatric or non-cooperative inpatients where bilateral hyperemia requires evaluation.
NCCI Bundling Considerations
Diagnostic eye exam codes (92002-92014) are not typically bundled against each other on the same date but are mutually exclusive by patient status (new vs. established) and exam complexity level. E/M office visit codes (992xx) generally should not be billed alongside ophthalmological service codes (920xx) for the same encounter unless a significant, separately identifiable service is documented with modifier -25. Foreign body removal codes (65205) may bundle with the exam code depending on payer-specific NCCI edits and should be verified against current CCI tables before unbundling.
🔬 ICD-10-PCS Crosswalk
- 08C83ZZ — Extirpation of matter from right conjunctiva, external approach. Applicable if hyperemia is accompanied by a foreign body or irritant requiring inpatient procedural removal.
- 08C93ZZ — Extirpation of matter from left conjunctiva, external approach. Left-sided equivalent for bilateral cases requiring staged or combined removal procedures.
- 08B83ZX — Excision of right conjunctiva, external approach, diagnostic. Used if a conjunctival biopsy is performed to rule out an underlying cause of persistent bilateral hyperemia.
- 08B93ZX — Excision of left conjunctiva, external approach, diagnostic. Left-sided diagnostic biopsy equivalent.
💊 Coding Scenarios and Examples
Scenario 1 — Postoperative Incidental Finding A patient is admitted for elective hip arthroplasty. On post-op day 1, the nursing note documents mild bilateral conjunctival hyperemia, thought to be related to positioning during surgery, with no discharge or treatment ordered.
- Correct coding: Principal diagnosis for the admission (hip arthroplasty aftercare/complication code as applicable), H11.433 as a secondary diagnosis.
- Sequencing explanation: H11.433 is sequenced after the principal diagnosis since it is an incidental postoperative finding, not the reason for admission.
- CDI note: No query needed if documentation clearly ties the finding to positioning with no further workup ordered.
Scenario 2 — Undifferentiated Red Eye in the ED-to-Inpatient Pathway A patient presents with bilateral red, watery eyes and is admitted for an unrelated condition. The physician documents “bilateral conjunctival hyperemia, etiology unclear, ophtho consult pending.”
- Correct coding: H11.433 as secondary diagnosis pending consult results; do not assign a conjunctivitis code without confirmed diagnosis.
- Sequencing explanation: Sequenced as a secondary/comorbid finding; principal diagnosis remains the confirmed reason for admission.
- CDI note: Flag chart for follow-up coding once ophthalmology consult results in a definitive diagnosis, which may supersede H11.433 if a specific etiology (e.g., viral conjunctivitis) is confirmed.
Scenario 3 — Query Triggered by Vague Documentation Nursing documentation states “eyes look red” with no laterality specified, in a patient with a known history of dry eye disease.
- Correct coding: Without laterality confirmation, default would fall to H11.439 (unspecified eye) rather than H11.433 — a CDI query should be initiated to confirm bilaterality before finalizing the bilateral code.
- Sequencing explanation: Not applicable until laterality is confirmed via query response.
- CDI note: This scenario is a textbook query trigger — physician confirmation of “both eyes” is required to support H11.433 over the unspecified alternative.
⚠️ Coding Pitfalls and Tips
- Do not default to H11.433 when documentation only says “red eyes” without confirming true bilateral involvement — verify laterality is explicitly stated before bypassing H11.439.
- Never code H11.433 alongside H16.23- keratoconjunctivitis codes for the same eye(s) — this violates the Excludes1 edit and will trigger a claim edit or denial.
- Remember this code carries zero HCC or DRG CC/MCC weight — don’t spend excessive CDI query time on this code alone unless it’s clarifying a more clinically significant underlying diagnosis.
- If the hyperemia is clearly tied to a specific diagnosed condition (allergic conjunctivitis, dry eye syndrome, post-surgical inflammation), code the underlying condition as primary rather than defaulting to the nonspecific sign code.
- In inpatient settings, confirm whether hyperemia is a new finding versus a chronic baseline noted in the patient’s history — chronic baseline findings are less likely to warrant separate coding unless clinically significant to the current stay.
- Watch for conflicting laterality documentation across different notes (e.g., nursing says bilateral, physician progress note says right eye only) — resolve via query rather than picking one source arbitrarily.
📚 Sources
- ICD10Data.com. “2026 ICD-10-CM Diagnosis Code H11.433.” Accessed 2026.
- ICD10Data.com. “2026 ICD-10-CM Diagnosis Code H11.433 — MS-DRG Grouping.” Accessed 2026.
- AAPC Codify. “ICD-10 Code for Other Conjunctival Vascular Disorders and Cysts — H11.4.” Accessed 2026.
- ICD10Data.com. “2026 ICD-10-CM Diagnosis Code H11.43: Conjunctival Hyperemia — Excludes1 Notes.” Accessed 2026.
- CMS.gov. “ICD-10-CM Official Guidelines for Coding and Reporting FY2026.” Centers for Medicare & Medicaid Services.
- CMS.gov. “MS-DRG Definitions Manual v43.0 — MDC 02.” Centers for Medicare & Medicaid Services.