How Do I Code Diabetes With Retinopathy? Severity, Macular Edema, and Laterality

Section I.C.4.a makes every diabetes code a combination code — type of diabetes, body system, complication — and the ophthalmic subcategory takes that further than any other: E11.32 through E11.35 add a 6th character for macular edema and a 7th character for laterality. The tabular note under each of them names its own subcategory; at E11.32 it reads: “One of the following 7th characters is to be assigned to codes in subcategory E11.32 to designate laterality of the disease: 1 right eye, 2 left eye, 3 bilateral, 9 unspecified eye.” The 7th character is required for the code to be valid (Section I.A.5), and Section I.B.13’s laterality rules apply: bilateral when both eyes are affected, unspecified eye rarely.

The Index route “Diabetes › type 2 › with › retinopathy” lands on E11.319, unspecified retinopathy without macular edema — the default when the record says only “diabetic retinopathy.” The unspecified subcategory E11.31 has no 7th character; the typed subcategories do.

1. Type of retinopathy, as documented: unspecified (E11.31), mild nonproliferative (E11.32), moderate (E11.33), severe (E11.34), proliferative (E11.35). The subcategories follow the tabular’s own order; the record’s wording picks one.
2. Macular edema: 6th character 1 with, 9 without (E11.311 / E11.319; E11.3211 / E11.3291, and so on). Under E11.35, 6th characters 2–5 identify traction retinal detachment involving the macula (2) or not involving it (3), combined traction and rhegmatogenous retinal detachment (4), and stable proliferative retinopathy (5).
3. Eye, for E11.32–E11.35: 7th character 1, 2, 3 or 9. Both eyes documented is 3 — one code, not two.
4. Macular edema that has resolved after treatment is its own code, E11.37, with a placeholder X and the same 7th-character set: E11.37X9 for unspecified eye.
5. Other ophthalmic complications: E11.36 diabetic cataract (no laterality); E11.39 other, with a Use Additional Code note for the manifestation such as diabetic glaucoma (H40–H42).
6. Add the Z79 control-agent code and any other complication codes — as many E11 codes as the documentation supports (I.C.4.a).

1. “Type 2 diabetes with diabetic retinopathy,” nothing more.E11.319 — unspecified type, no macular edema documented, and E11.31 takes no laterality character.
2. Type 2 diabetes with mild nonproliferative retinopathy and macular edema, right eye.E11.3211: mild NPDR (32), with edema (1), right eye (1).
3. Proliferative retinopathy without macular edema in both eyes.E11.3593: proliferative (35), without edema (9), bilateral (3) — one code for both eyes, per Section I.B.13.
4. Macular edema in the left eye treated and documented as resolved; retinopathy no longer described.E11.37X2, with the placeholder X in the 6th position and 2 for the left eye.

• Dropping the 7th character on E11.32–E11.35 — the code is invalid without it.
• Adding a 7th character to E11.31 — the unspecified subcategory has none.
• Reporting right and left codes when both eyes are affected — 7th character 3 is the bilateral code.
• Coding “diabetic retinopathy” to a typed subcategory the record does not support — unspecified type is E11.31.
• Reporting a separate H35 retinopathy code beside the E11.3- code — the combination code already classifies the retinopathy.
• Omitting the X in E11.37 — the placeholder is part of the code.

• The retinopathy type — mild, moderate or severe nonproliferative, or proliferative — from the provider.
• Whether macular edema is present, or documented as resolved after treatment (E11.37).
• The eye or eyes affected; if not stated by the provider, another clinician’s documentation may supply it, and unspecified eye is a last resort (I.B.13).
• Other ophthalmic diagnoses — cataract (E11.36) or glaucoma (E11.39 plus the H40–H42 code) — each takes its own combination code.