H33.302 vs H33.303

H33.302 (Unspecified retinal break, left eye) compared with H33.303 (Unspecified retinal break, bilateral), from the official CMS tabular data.

Summary

These codes name the same condition on opposite sides of the body, so the documented side decides which one applies.

MedCoder-derived

What is different?

Title wording.The titles share “Unspecified retinal break”; H33.302 says “left eye” where H33.303 says “bilateral”.

Registry fact

Can these codes be reported together?

One side per condition.H33.302 and H33.303 name the same condition on opposite sides of the body. Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.

MedCoder-derivedGuide: Laterality coding

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code. H33.302 carries 2 Excludes1 notes and H33.303 carries 2 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

None.Neither entry carries an Excludes2 note that names the other code. H33.302 carries 1 Excludes2 note and H33.303 carries 1 Excludes2 note covering other codes; the side-by-side table quotes them.

Official rule

Is one more specific?

No.Both titles are unspecified forms within category H33, and neither is a subdivision of the other.

Registry fact

Is one a parent or header code?

No.Both are billable codes, and neither contains the other.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

Yes.Same condition, opposite side. H33.302 and H33.303 name the same condition on opposite sides of the body.

MedCoder-derivedGuide: Laterality coding

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Review

Laterality relationship

H33.302

Left

Unspecified retinal break, left eye

↔

H33.303

Bilateral

Unspecified retinal break, bilateral

What we found

Same condition, opposite side.H33.302 and H33.303 name the same condition on opposite sides of the body.

Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.

What to review

Report the side the documentation names. Where the code set provides a bilateral code and both sides are documented, use it instead of the pair.

Guide: Laterality coding Check these on a claim

Why it matters

These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.

Source / rule

ICD-10-CM tabular list (laterality variant derived from the code title)

Official guidance behind these answers

Section I.B.13 — Laterality · applies to: Laterality
Some ICD-10-CM codes indicate laterality, specifying whether the condition occurs on the left, right or is bilateral. If no bilateral code is provided and the condition is bilateral, assign separate codes for both the left and right side. If the side is not identified in the medical record, assign the code for the unspecified side. When a patient has a bilateral condition and each side is treated during separate encounters, assign the "bilateral" code (as the condition still exists on both sides), including for the encounter to treat the first side. For the second encounter for treatment after one side has previously been treated and the condition no longer exists on that side, assign the appropriate unilateral code for the side where the condition still exists (e.g., cataract surgery performed on each eye in separate encounters). The bilateral code would not be assigned for the subsequent encounter, as the patient no longer has the condition in the previously-treated site. If the treatment on the first side did not completely resolve the condition, then the bilateral code would still be appropriate. When laterality is not documented by the patient’s provider, code assignment for the affected side may be based on medical record documentation from other clinicians. If there is conflicting medical record documentation regarding the affected side, the patient’s provider should be queried for clarification. […]
ICD-10-CM Official Guidelines FY2027

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

	H33.302Unspecified retinal break, left eye	H33.303Unspecified retinal break, bilateral
Billing status	Billable	Billable
Classification	H00-H59 — Diseases of the Eye and Adnexa (H00-H59)	H00-H59 — Diseases of the Eye and Adnexa (H00-H59)
Definition	Unspecified retinal break, left eye is a billable ICD-10-CM diagnosis code (H33.302).	Unspecified retinal break, bilateral is a billable ICD-10-CM diagnosis code (H33.303).
Excludes1	chorioretinal scars after surgery for detachment (H59.81-) detachment of retinal pigment epithelium (H35.72-, H35.73-)	chorioretinal scars after surgery for detachment (H59.81-) detachment of retinal pigment epithelium (H35.72-, H35.73-)
Excludes2	peripheral retinal degeneration without break (H35.4-)	peripheral retinal degeneration without break (H35.4-)

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on.

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Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources