H35.043

🧬 ICD-10-CM H35.043 — Retinal Micro-Aneurysms, Unspecified, Bilateral

Code Classification

ICD-10-CM Diagnosis Code — This is a diagnosis code. Fields for wRVU, assistant payable, and global period are not applicable. For associated inpatient procedure coding, see the ICD-10-PCS Crosswalk section below.

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🔍 Code Description

H35.043 classifies retinal micro-aneurysms, unspecified, bilateral — focal outpouchings of the retinal capillary wall occurring in both eyes, without documentation of a specific underlying systemic etiology at the time of coding.¹

The term micro-aneurysm refers to tiny (10-100 μm), round, saccular dilations of the retinal capillary wall, arising from focal weakness in the pericyte-endothelial cell barrier. They appear clinically as small, discrete red dots on fundoscopic examination, typically located at or near the posterior pole, and are best demonstrated on fluorescein angiography as hyperfluorescent pinpoint lesions with late staining.²

The qualifier “unspecified” in H35.043 refers to the etiology — not the severity or extent of involvement. This code is appropriate when microaneurysms are documented bilaterally but no causative condition (e.g., diabetes mellitus, hypertension, sickle cell disease) has been recorded. When a systemic cause is identified, the etiology-specific code governs assignment. The bilateral character (laterality character 3) indicates involvement of both the right and left eyes in the same encounter.

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🌳 Code Tree / Hierarchy

H35 Other Retinal Disorders  
│  
├── H35.0 Background Retinopathy and Retinal Vascular Changes ◀ SUBCATEGORY  
│ │ [Code also: any associated hypertension (I10-I15)]  
│ │ [Excludes2: diabetic retinal disorders — use E08-E13 series]  
│ │  
│ ├── H35.00 Unspecified background retinopathy  
│ ├── H35.01 Changes in retinal vascular appearance  
│ │ ├── H35.011 Right eye  
│ │ ├── H35.012 Left eye  
│ │ ├── H35.013 Bilateral  
│ │ └── H35.019 Unspecified eye  
│ ├── H35.02 Exudative retinopathy (Coats disease)  
│ │ ├── H35.021 Right eye  
│ │ ├── H35.022 Left eye  
│ │ ├── H35.023 Bilateral  
│ │ └── H35.029 Unspecified eye  
│ ├── H35.03 Hypertensive retinopathy  
│ │ ├── H35.031 Right eye  
│ │ ├── H35.032 Left eye  
│ │ ├── H35.033 Bilateral  
│ │ └── H35.039 Unspecified eye  
│ ├── H35.04 Retinal micro-aneurysms, unspecified ◀ PARENT CATEGORY  
│ │ ├── H35.041 Right eye  
│ │ ├── H35.042 Left eye  
│ │ ├── H35.043 Bilateral ◀ THIS CODE  
│ │ └── H35.049 Unspecified eye  
│ ├── H35.05 Retinal neovascularization, unspecified  
│ │ ├── H35.051-H35.059 (laterality variants)  
│ ├── H35.06 Retinal vasculitis  
│ ├── H35.07 Separation of retinal layers  
│ └── H35.09 Other intraretinal microvascular abnormalities  
│  
├── H35.1 Retinopathy of prematurity  
├── H35.2 Other non-diabetic proliferative retinopathy  
├── H35.3 Degeneration of macula and posterior pole  
│ ├── H35.31 Nonexudative age-related macular degeneration  
│ ├── H35.32 Exudative age-related macular degeneration  
│ ├── H35.36 Drusen (degenerative) of macula  
│ └── H35.37 Puckering of macula  
├── H35.4 Peripheral retinal degeneration  
├── H35.5 Hereditary retinal dystrophy  
├── H35.6 Retinal hemorrhage  
└── H35.8 Other specified retinal disorders

Laterality — Do Not Default to "Unspecified Eye"

Always assign the laterality-specific code when documented. Reserve H35.049 (unspecified eye) only when laterality is truly indeterminate after query. For bilateral involvement clearly documented in both eyes on the same encounter, H35.043 is the correct assignment — do not code H35.041 and H35.042 separately for a bilateral finding.

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✅ Includes / Use Additional Code

The following clinical terms map to H35.043 and its parent subcategory H35.04x:¹

• Bilateral microaneurysm of retinal arteries, NOS
• Bilateral retinal microaneurysms, NOS

Use additional code (instructional note at H35.0 subcategory level):

• I10-I15 — Code any associated hypertension when hypertension is a documented contributing or comorbid condition.

"Code Also" Is Not Optional When Hypertension Is Present

The ICD-10-CM tabular instruction at the H35.0 subcategory level directs the coder to “Code also: any associated hypertension (I10-I15)“. If the physician documents hypertension in the same encounter and it is clinically associated with or contributing to the retinal findings, I10 (or the appropriate I11-I15 code for hypertension with organ involvement) must be assigned in addition to H35.043. Failure to capture this instruction is an audit risk and may result in code set incompleteness. Note: hypertensive retinopathy (H35.03x) is a separate, distinct subcategory — if the physician specifically documents hypertensive retinopathy, that code takes precedence over H35.04x.

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❌ Excludes

Excludes 2 — Assign Instead of (or in Addition to) H35.043 When Applicable¹

Code Range	Description	Coding Action
E08.311-E08.359	Drug/chemical-induced DM diabetic retinopathy	Use diabetic retinopathy code — NOT H35.043
E09.311-E09.359	Secondary DM due to other condition, diabetic retinopathy	Use diabetic retinopathy code — NOT H35.043
E10.311-E10.359	Type 1 DM with diabetic retinopathy	Use diabetic retinopathy code — NOT H35.043
E11.311-E11.359	Type 2 DM with diabetic retinopathy	Use diabetic retinopathy code — NOT H35.043
E13.311-E13.359	Other specified DM with diabetic retinopathy	Use diabetic retinopathy code — NOT H35.043

The Most Critical Coding Decision for H35.043 — Diabetes Status

The Excludes 2 note at the H35 category level means that diabetic retinal disorders are classified entirely within the diabetes mellitus code categories (E08-E13), not here. In practice, this means:

• If the patient has documented diabetes mellitus AND retinal microaneurysms → Assign the diabetic retinopathy combination code (e.g., E11.319 for Type 2 DM with unspecified diabetic retinopathy without macular edema). Do NOT assign H35.043.
• If the patient does NOT have documented diabetes AND has retinal microaneurysms → H35.043 is appropriate.
• If diabetes is present but the physician explicitly documents the microaneurysms as non-diabetic in etiology → Both may theoretically be assignable under Excludes 2 logic, but this scenario is clinically rare and requires explicit physician documentation to support dual coding. A CDI query is strongly recommended before coding both.

Assigning [[H35.043]] in a diabetic patient without investigating the etiology is one of the most common ophthalmology coding errors and is an active Medicare audit trigger.

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📋 Clinical Overview

Pathophysiology

Retinal microaneurysms arise from focal breakdown of the pericyte-endothelial cell relationship within retinal capillaries. Pericytes — contractile cells that wrap around capillary walls — normally maintain structural integrity, regulate blood flow, and suppress endothelial proliferation. When pericytes are lost or dysfunctional (as in chronic hyperglycemia, oxidative stress from hypertension, or hemoglobin sickling), focal capillary wall weakness develops, leading to saccular outpouching of the vessel wall.²

The resulting microaneurysm has a thin, permeable wall that leaks plasma proteins, lipoproteins, and erythrocytes into the surrounding retinal tissue. Over time, leaked lipoproteins form hard exudates and leaked erythrocytes produce dot and blot hemorrhages — findings that frequently accompany microaneurysms on fundoscopic examination and can be coded additionally when documented.²

Etiology

Etiology	Associated Systemic Codes	Notes
Diabetes mellitus (most common)	E08-E13 diabetic retinopathy codes	Do not use H35.043 — use specific diabetic retinopathy combination code
Systemic hypertension	H35.031-H35.033 (hypertensive retinopathy) or H35.043 + I10	If physician documents “hypertensive retinopathy,” use H35.03x; if microaneurysms only, [[H35.043]] + I10
Retinal vein occlusion	H34.231-H34.239 (central); H34.831-H34.839 (branch)	Code the vein occlusion; microaneurysms are expected sequelae
Sickle cell disease	D57.x series (by type)	Sickle cell retinopathy produces peripheral microaneurysms; code underlying sickle cell
Radiation retinopathy	H35.021-H35.023 (exudative retinopathy) or external cause code	Document radiation history
Idiopathic	[[H35.043]] — no additional etiology code	Appropriate when workup is negative and no systemic condition is documented

CDI Query Opportunity — Etiology of Bilateral Microaneurysms

When retinal microaneurysms are identified bilaterally in a patient with any history of diabetes, hypertension, or hematologic disease, a CDI query to the ophthalmologist is appropriate to establish whether the microaneurysms are attributable to the systemic condition. Clarifying the etiologic relationship drives the correct code selection and directly impacts HCC capture, risk adjustment accuracy, and DRG integrity.

Clinical Presentation

Patients with retinal microaneurysms may present with:²

• Asymptomatic — early microaneurysms are often discovered incidentally on routine dilated fundus examination, particularly in patients being screened for diabetic eye disease
• Mild visual blurring — when microaneurysms are located near the fovea or associated with early macular edema from plasma leakage
• Metamorphopsia — distortion of straight lines, suggesting early macular involvement
• Decreased visual acuity — in cases with significant associated exudation or macular edema

Fundoscopic findings:

• Tiny, discrete red dots (10-100 μm) at or near the posterior pole
• Bilateral symmetric distribution (when non-diabetic and systemic etiology present)
• May be accompanied by hard exudates, dot hemorrhages, or retinal thickening
• Fluorescein angiography: hyperfluorescent pinpoint lesions, some with leakage on late-phase images

Documentation Requirements

For accurate, defensible assignment of [[H35.043]], physician documentation should include:¹

1. Bilateral involvement — explicitly both eyes documented
2. Absence of diabetic etiology — critical for use of H35.04x over E11.31x-E11.35x
3. Etiology or suspected cause — if identified (hypertension, vein occlusion, sickle cell), drives additional or alternative code assignment
4. Associated findings — hard exudates, retinal hemorrhage, macular edema — each separately codable when documented
5. Clinical status — active, stable, or resolving; relevant to follow-up encounter coding

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💰 HCC Risk Adjustment (CMS-HCC v28)

Field	Detail
CMS-HCC Model Version	v28 (2024-2025 Implementation)
HCC Assignment	❌ Not Mapped
HCC Category	N/A
RAF Coefficient	0.000
RxHCC Assignment	Not Mapped

H35.043 does not map to a Hierarchical Condition Category (HCC) under CMS-HCC v28 and contributes no Risk Adjustment Factor (RAF) to the patient’s Medicare Advantage risk score.³

HCC Capture Opportunity — Look to the Etiology

While [[H35.043] itself carries no HCC weight, the underlying systemic condition driving the microaneurysms almost always does:

• Diabetes mellitus → HCC 18 (Diabetes with Ophthalmologic or Unspecified Manifestation) — significant RAF weight; requires use of E11.311-E11.359 instead of H35.043
• Sickle cell disease → HCC 46 (Sickle Cell Anemia/Other Hemoglobin Disorders)
• Retinal vein occlusion with associated systemic vascular disease → Review for cardiovascular HCCs

In a Medicare Advantage patient presenting with bilateral microaneurysms, always investigate and document all comorbidities meeting UHDDS criteria. A complete problem list dramatically impacts risk-adjusted payment accuracy.

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🏥 MS-DRG Assignment

MDC 02 — Diseases and Disorders of the Eye

DRG	Title	Est. Relative Weight*
DRG 124	Other Disorders of the Eye with MCC	~0.95-1.15
DRG 125	Other Disorders of the Eye with CC	~0.70-0.90
DRG 126	Other Disorders of the Eye without CC/MCC	~0.50-0.70

*Relative weights are approximate. Verify against the applicable IPPS FY2025 Final Rule tables for the fiscal year being coded.⁴

Principal Diagnosis Determines MDC — Systemic Etiologies Can Override

When H35.043 is assigned as the principal diagnosis, the encounter groups to MDC 02. However, if the admission is driven by a systemic condition causing the microaneurysms — for example, a hypertensive urgency admission (I16.0) or a sickle cell crisis (D57.xx) where the retinal finding is discovered incidentally — the systemic condition sequences as principal, and the encounter may group to MDC 05 (Circulatory) or MDC 16 (Blood) respectively.

Always apply the UHDDS definition of principal diagnosis: the condition established after study to be chiefly responsible for occasioning the admission. Do not default to the ophthalmologic code if the systemic condition drove the admission.

CC/MCC Capture Opportunities Relevant to an Ophthalmology Stay:

• MCCs: Sepsis, acute respiratory failure, HIV disease, acute MI, stroke
• CCs: Diabetes mellitus with complications, hypertensive heart disease, moderate-to-severe vision impairment (H54.x), retinal detachment, sickle cell disorders

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🔗 Related ICD-10-CM Codes

Laterality Variants of This Code

Code	Description
H35.041	Retinal micro-aneurysms, unspecified, right eye
H35.042	Retinal micro-aneurysms, unspecified, left eye
H35.043	Retinal micro-aneurysms, unspecified, bilateral ← This Code
H35.049	Retinal micro-aneurysms, unspecified, unspecified eye

Adjacent Background Retinopathy Codes (H35.0x)

Code	Description	Relationship
H35.013	Changes in retinal vascular appearance, bilateral	Early vascular change — precedes microaneurysm development
H35.023	Exudative retinopathy (Coats disease), bilateral	Distinct entity — exudative, not microaneurysmal
H35.033	Hypertensive retinopathy, bilateral	Assign when hypertension is specifically the documented cause of retinopathy pattern
H35.053	Retinal neovascularization, unspecified, bilateral	Progressive finding — may accompany advanced microaneurysmal disease

Diabetic Retinopathy Codes — Use Instead When DM Is Documented

Code	Description	HCC?
E11.311	Type 2 DM with unspecified diabetic retinopathy, right eye	✅ HCC 18
E11.312	Type 2 DM with unspecified diabetic retinopathy, left eye	✅ HCC 18
E11.313	Type 2 DM with unspecified diabetic retinopathy, bilateral	✅ HCC 18
E11.3211	Type 2 DM with mild nonproliferative diabetic retinopathy w/o macular edema, right	✅ HCC 18
E11.3213	Type 2 DM with mild nonproliferative diabetic retinopathy w/o macular edema, bilateral	✅ HCC 18
E10.313	Type 1 DM with unspecified diabetic retinopathy, bilateral	✅ HCC 18

Associated Finding Codes (May Code Additionally When Documented)

Code	Description	Notes
H35.813	Retinal edema, bilateral	Code additionally if macular edema is documented separately
H35.713	Retinal hemorrhage, bilateral	Dot/blot hemorrhages accompanying microaneurysms
H35.363	Drusen (degenerative) of macula, bilateral	If concurrent drusen are documented
H53.133	Sudden visual loss, bilateral	If acute visual change documented
H54.3	Unqualified visual loss, both eyes	Vision impairment — may serve as CC

Systemic Etiology Codes

Code	Description	Relationship
I10	Essential (primary) hypertension	”Code also” per H35.0 tabular instruction
D57.1	Sickle cell disease without crisis	Peripheral microaneurysms in sickle cell retinopathy
H34.233	Central retinal vein occlusion, bilateral	CRVO drives microaneurysm development as sequela
H34.833	Tributary (branch) retinal vein occlusion, bilateral	BRVO-associated microaneurysms

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🛠️ Commonly Associated CPT Codes (Ophthalmology)

Outpatient and Physician Setting Context

The CPT codes below represent diagnostic workup and management associated with bilateral retinal microaneurysms in the outpatient or physician fee schedule setting. In the inpatient setting, ICD-10-PCS codes govern procedural reporting — see the PCS Crosswalk section below.

CPT Code	Description	Clinical Application
92004	Ophthalmological exam, comprehensive, new patient	Initial evaluation of bilateral fundus findings
92014	Ophthalmological exam, comprehensive, established patient	Follow-up monitoring of known microaneurysms
92250	Fundus photography with interpretation and report	Documents bilateral microaneurysm location, size, and number; tracks progression — supports medical necessity for H35.043 per CMS LCD
92235	Fluorescein angiography with interpretation and report	Gold standard for identifying and characterizing microaneurysms; distinguishes leaking from non-leaking lesions
92134	Scanning computerized ophthalmic diagnostic imaging, posterior segment (OCT)	Retinal thickness mapping; macular edema detection; H35.043 listed as a covered diagnosis on CMS OCT LCD
92083	Visual field examination	Peripheral field assessment when neovascularization or vascular occlusion complicates the clinical picture
67210	Photocoagulation treatment, macular and retinal lesion	Focal laser treatment of leaking microaneurysms when macular edema is present and documented
67028	Intravitreal injection of pharmacologic agent	Anti-VEGF or corticosteroid injection when macular edema associated with microaneurysms warrants treatment

NCCI Bundling Considerations

NCCI PTP Edits — Verify Before Billing

• 92250 and 92235 billed same DOS: subject to NCCI PTP edit review. Confirm current edit status — fundus photography and fluorescein angiography may require separate medical necessity documentation when billed together.
• 67028 (intravitreal injection) with E/M same DOS: Modifier -25 must be appended to the E/M code (92014) to identify it as a significant, separately identifiable service beyond the pre/post-procedure assessment. Without -25, the E/M is at risk for denial as bundled.
• 92134 (OCT) is specifically listed as a medically necessary code for H35.043 per CMS LCD — ensure diagnosis is on the claim when billing.
• 67210 (laser photocoagulation) and 92235 (fluorescein angiography) same DOS: The FA typically drives the treatment decision; billing both same session is common in ophthalmology but verify NCCI for current edit status.

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🔬 ICD-10-PCS Crosswalk (Inpatient Procedures)

When H35.043 is an inpatient diagnosis and a procedure is performed, the following ICD-10-PCS sections and root operations are relevant. Full PCS codes require completion of all seven characters — consult the FY2025 PCS tables.⁵

PCS Section	Body System	Root Operation	Clinical Application
0 (Medical & Surgical)	8 (Eye)	5 (Destruction)	Laser photocoagulation of retinal microaneurysms or leaking vessels — destroys abnormal tissue via thermal energy; Body Part: Retina (Right = J, Left = K); Approach: 3 (Percutaneous via contact lens system); Device: Z; Qualifier: Z
3 (Administration)	E (Physiological Systems & Anatomical Regions)	0 (Introduction)	Intravitreal injection of pharmacologic agent (anti-VEGF, corticosteroid) for associated macular edema — Body Part: C (Eye); Approach: 3 (Percutaneous); code bilaterally with separate PCS codes for right and left
0 (Medical & Surgical)	8 (Eye)	9 (Drainage)	Diagnostic vitreous aspiration if sampling required — Body Part: Vitreous (Right = 5, Left = 6); Approach: 3 (Percutaneous); Qualifier: X (Diagnostic)

Bilateral Procedures Require Separate PCS Codes

ICD-10-PCS does not have a bilateral qualifier for most Eye body part values. When laser photocoagulation or intravitreal injection is performed bilaterally, assign two separate PCS codes — one for the right eye and one for the left eye. This applies to both Destruction (085J3ZZ for right retina, 085K3ZZ for left retina) and Administration (Introduction into right eye and left eye separately). Do not attempt to capture bilateral treatment in a single PCS code.

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💊 Coding Scenarios and Examples

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Scenario 1 — Idiopathic Bilateral Retinal Microaneurysms, No Systemic Etiology (Outpatient)

Clinical Vignette: A 52-year-old non-diabetic, normotensive male presents for routine comprehensive eye examination. Dilated fundus examination reveals scattered microaneurysms bilaterally at the posterior poles, confirmed by fluorescein angiography. Hemoglobin A1c is 5.4%. No vascular occlusive disease or hematologic disorders documented. Impression: bilateral retinal microaneurysms, etiology undetermined.

CPT Codes:

• 92014 — Comprehensive ophthalmological exam, established patient
• 92235 — Fluorescein angiography with interpretation and report (modifier -25 not needed — not same session as injection)
• 92250 — Fundus photography (verify NCCI edit with 92235 — may need separate DOS or modifier)

ICD-10-CM Diagnosis Code:

• [[H35.043] — Retinal micro-aneurysms, unspecified, bilateral (appropriate — no diabetic or hypertensive etiology)

HbA1c Documentation Opportunity

When a non-diabetic patient presents with bilateral microaneurysms and the workup includes HbA1c testing to exclude diabetes, document the result in the medical record. If HbA1c is in the prediabetic range (5.7-6.4%), consider whether R73.09 (other abnormal glucose) is appropriate as an additional code, and query the physician. If the result is normal (< 5.7%), H35.043 stands alone as idiopathic.

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Scenario 2 — Bilateral Microaneurysms in Hypertensive Patient (Outpatient)

Clinical Vignette: A 61-year-old female with a documented history of essential hypertension (currently managed with lisinopril) presents for ophthalmology follow-up. Fundus exam shows bilateral scattered microaneurysms without arteriovenous nicking or copper wiring changes. The ophthalmologist documents: “bilateral retinal microaneurysms — consistent with hypertensive background retinopathy.” OCT posterior segment is performed to assess for macular involvement; retinal thickness is normal bilaterally.

CPT Codes:

• 92014 — Comprehensive ophthalmological exam, established patient
• 92134 — OCT posterior segment (H35.043 is a covered LCD diagnosis — no modifier needed)

ICD-10-CM Diagnosis Codes:

• H35.043 — Retinal micro-aneurysms, unspecified, bilateral (primary ophthalmic finding)
• I10 — Essential (primary) hypertension (“Code also” per H35.0 tabular instruction — mandatory when hypertension is documented)

H35.033 vs. H35.043 — Which Code Applies?

This scenario illustrates a common choice point:

• If the ophthalmologist documents “hypertensive retinopathy” → assign H35.033 (bilateral) + I10
• If the ophthalmologist documents “microaneurysms associated with hypertension” or “hypertensive background retinopathy” → H35.043 + I10 is supportable
• If documentation is ambiguous, query the physician to clarify whether the full retinopathy pattern is present or only isolated microaneurysms The distinction between H35.033 and H35.043 in a hypertensive patient is a documentation and coding specificity issue — not a clinical one. Both require I10.

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Scenario 3 — Bilateral Microaneurysms Discovered During Type 2 Diabetic Patient Admission (Inpatient)

Clinical Vignette: A 67-year-old male with Type 2 diabetes mellitus (uncontrolled) is admitted for hyperglycemic hyperosmolar state. Ophthalmology is consulted during admission. Dilated fundus exam reveals bilateral microaneurysms. Ophthalmology documents: “bilateral early diabetic retinopathy — microaneurysms bilaterally, no macular edema.”

Principal Diagnosis:

• E11.00 — Type 2 diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC) (reason for admission)

Additional Diagnoses:

• E11.313 — Type 2 diabetes mellitus with unspecified diabetic retinopathy, bilateral (documents the ophthalmologic manifestation — do NOT assign H35.043)

MS-DRG Assignment:

• This encounter groups to MDC 10 (Endocrine, Nutritional and Metabolic Diseases) — not MDC 02 — because the diabetic complication drives the principal diagnosis.

Do NOT Assign H35.043 in This Scenario

When the ophthalmologist explicitly links the microaneurysms to the patient’s diabetes mellitus, H35.043 must not be assigned. The Excludes 2 at H35 instructs use of the E11.311-E11.359 series. Assigning H35.043 alongside a diabetic retinopathy code (E11.31x) when the microaneurysms are the same finding is a payer audit risk and results in code set inaccuracy. Use E11.313 only.

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Scenario 4 — Bilateral Microaneurysms with Macular Edema, Intravitreal Injection (Outpatient)

Clinical Vignette: A 58-year-old female with no documented systemic disease presents with decreased bilateral vision. Examination reveals bilateral microaneurysms with associated bilateral center-involving macular edema confirmed on OCT. Fluorescein angiography demonstrates bilateral leaking microaneurysms at the macula. Bilateral intravitreal bevacizumab injections are performed.

CPT Codes:

• 92014 — Comprehensive ophthalmological exam, established patient (modifier -25 required — significant, separate E/M performed beyond pre/post-injection assessment)
• 92235 — Fluorescein angiography with interpretation (drives treatment decision)
• 92134 — OCT posterior segment (macular edema assessment)
• 67028--RT — Intravitreal injection, right eye
• 67028--LT — Intravitreal injection, left eye

ICD-10-CM Diagnosis Codes:

• H35.043 — Retinal micro-aneurysms, unspecified, bilateral
• H35.813 — Retinal edema, bilateral (associated macular edema — separately documented and codeable)

Bilateral Injections — Bill Separately with Laterality Modifiers

When intravitreal injections are performed bilaterally in the same session, report 67028 twice — once with modifier -RT and once with modifier -LT. Do not report 67028 with bilateral modifier -50 unless your payer specifically requires it; most ophthalmology payers prefer the -RT/-LT approach. Verify payer-specific bilateral injection billing policy, as coverage and payment rules vary significantly between Medicare, Medicaid, and commercial payers.

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⚠️ Coding Pitfalls and Tips

	Pitfall or Tip
❌	Never assign H35.043 when diabetes mellitus is the documented etiology — use E11.313 (or type-equivalent) per Excludes 2 instruction; this is the single most common error with this code
❌	Do not default to H35.049 (unspecified eye) when bilateral involvement is documented — H35.043 is the correct bilateral code
❌	Do not code H35.041 and H35.042 separately to represent bilateral involvement — when both eyes are documented together as bilateral, H35.043 is a single code that captures both
❌	Do not ignore the “Code also” instruction for hypertension at the H35.0 level — I10 (or I11-I15) must be added when hypertension is documented
❌	Do not confuse H35.033 (hypertensive retinopathy) with H35.043 + I10 — if the physician says “hypertensive retinopathy,” use H35.033; if they describe microaneurysms in a hypertensive patient without the full retinopathy pattern, H35.043 + I10 applies
✅	Query for etiology whenever bilateral microaneurysms are found in a patient with diabetes, hypertension, sickle cell, or prior radiation — clarifying the etiologic link drives correct code selection
✅	Check for associated macular edema (H35.813) — when present and documented, it is separately codeable and may elevate the encounter’s severity weighting
✅	For inpatient encounters, assign separate ICD-10-PCS codes for right and left eye procedures — bilateral is not available in most Eye body part PCS tables
✅	H35.043 supports medical necessity for OCT (92134) per CMS LCD — ensure this diagnosis is on the claim when billing posterior segment OCT for bilateral microaneurysm monitoring
✅	In Medicare Advantage patients, use this finding as a prompt to review the complete problem list for HCC-bearing comorbidities (diabetes, vascular disease, sickle cell) that may be underdocumented

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📚 Sources

1. CMS/NCHS. ICD-10-CM Official Guidelines for Coding and Reporting, FY2025; Tabular List of Diseases and Injuries — H35 Other Retinal Disorders, H35.0 Background Retinopathy and Retinal Vascular Changes, including “Code also” and Excludes 2 notations.

2. Bhavsar AR, Bhavsar SG, Jager RD. “Retinal Microaneurysms.” In: Yanoff M, Duker JS. Ophthalmology, 5th ed. Elsevier; 2019. Chapter on Retinal Vascular Disease.

3. CMS. 2024 Medicare Advantage Risk Adjustment — CMS-HCC Model v28 ICD-10-CM Mappings. Baltimore, MD: Centers for Medicare & Medicaid Services.

4. CMS. IPPS Final Rule FY2025 — MS-DRG Definitions Manual v42. MDC 02 — Diseases and Disorders of the Eye, DRGs 124-126 logic tables.

5. CMS. ICD-10-PCS Reference Manual FY2025; PCS Tables — Section 0 (Medical & Surgical), Body System 8 (Eye), Root Operations 5 (Destruction) and 9 (Drainage); Section 3 (Administration), Body System E, Root Operation 0 (Introduction).

6. AMA. CPT Professional Edition 2025. Ophthalmology subsection (92002-92499); Surgery/Eye and Ocular Adnexa (65091-68899).

7. CMS. Local Coverage Article: Billing and Coding: Scanning Computerized Ophthalmic Diagnostic Imaging (SCODI). Article A56916. Centers for Medicare & Medicaid Services; revised 2024. Confirms H35.043 as a covered diagnosis for 92134.

8. CMS. NCCI Policy Manual for Medicare Services, v31.0; Ophthalmology chapter — correct coding principles for 92235, 92250, 67028, and E/M bundling rules.