H40.832 ICD-10-CM Code: Aqueous misdirection, left eye
H40.832 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools
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FY 2026 Apr update / Diseases of the eye and adnexa (H00-H59) / Glaucoma (H40-H42)
H40.832
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceAqueous misdirection, left eye
This condition occurs when fluid (aqueous humor) in the left eye flows in an abnormal direction, typically backward instead of forward through the eye's drainage system. This misdirection can increase eye pressure and potentially damage the optic nerve.
Buddy Insight
Aqueous misdirection, also known as malignant glaucoma or ciliary block glaucoma, is a serious condition where aqueous humor is misdirected posteriorly into the vitreous cavity rather than flowing anteriorly through the pupil.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
MappedHCC 244
Code-level coefficient reference
Code Book Path
Inclusion Terms
Official- Malignant glaucomaInherited from H40.83
Excludes 2
Official- certain conditions originating in the perinatal period (P04-P96)Inherited from H00-H59
- certain infectious and parasitic diseases (A00-B99)Inherited from H00-H59
- complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from H00-H59
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from H00-H59
- diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)Inherited from H00-H59
- endocrine, nutritional and metabolic diseases (E00-E88)Inherited from H00-H59
- injury (trauma) of eye and orbit (S05.-)Inherited from H00-H59
- injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from H00-H59
- neoplasms (C00-D49)Inherited from H00-H59
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from H00-H59
- syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)Inherited from H00-H59
Related Codes
Includes
OfficialNo Includes notes are included in this display for H40.832. Check the code and parent instructions in the Code Book.
Excludes 1
Official- absolute glaucoma (H44.51-)Inherited from H40
- congenital glaucoma (Q15.0)Inherited from H40
- traumatic glaucoma due to birth injury (P15.3)Inherited from H40
Code First
OfficialNo Code First sequencing instructions are included in this display for H40.832. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for H40.832. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for H40.832. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is H40.832 an HCC code?
H40.832 has no mapping under the current CMS-HCC V28 community payment model. H40.832 has a separate mapping under the Part D RxHCC model (HCC 244 (Other Non-Acute Glaucoma)); the applicable result needs member context.
- Code
- H40.832
- Description
- Aqueous misdirection, left eye
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.
Work H40.832 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for H40.832
For H40.832, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Coder workflow notes
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What This Code Means
H40.832 is the ICD-10-CM diagnosis code for aqueous misdirection, left eye. This condition occurs when fluid (aqueous humor) in the left eye flows in an abnormal direction, typically backward instead of forward through the eye's drainage system. This misdirection can increase eye pressure and potentially damage the optic nerve. H40.832 sits in the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59), within the section covering glaucoma (h40-h42).
H40.832 has no mapping under the current CMS-HCC V28 community payment model. H40.832 has a separate mapping under the Part D RxHCC model (HCC 244 (Other Non-Acute Glaucoma)); the applicable result needs member context. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.
Ensure laterality is documented in the medical record as 'left eye' to support the 'left eye' designation in this code.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for H40.832 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Ensure laterality is documented in the medical record as 'left eye' to support the 'left eye' designation in this code
- •Verify this is not a secondary effect of other eye conditions like glaucoma or post-surgical complications, as those may require additional codes
Clinical Significance
Aqueous misdirection, also known as malignant glaucoma or ciliary block glaucoma, is a serious condition where aqueous humor is misdirected posteriorly into the vitreous cavity rather than flowing anteriorly through the pupil. This creates a dangerous cycle of rising intraocular pressure that can be refractory to standard glaucoma treatments. It often occurs after intraocular surgery and requires urgent intervention.
Documentation Requirements
- ✓Laterality clearly specified as left eye
- ✓Clinical or imaging evidence of posterior aqueous misdirection (shallow or flat anterior chamber with elevated intraocular pressure)
- ✓Intraocular pressure measurement
- ✓History of precipitating event if applicable (e.g., recent intraocular surgery, laser treatment)
- ✓Anterior segment examination findings including anterior chamber depth
- ✓B-scan ultrasound or anterior segment optical coherence tomography results if performed
- ✓Treatment approach documented (medical, laser, or surgical intervention)
Commonly Confused Codes
- •H40.211-H40.219: Acute angle-closure glaucoma (different mechanism; pupillary block vs. ciliary block)
- •H40.821-H40.829: Hypersecretion glaucoma (overproduction of aqueous, not misdirection)
- •H40.50-H40.53: Secondary glaucoma due to other eye diseases (less specific than aqueous misdirection)
- •H59.011-H59.019: Postprocedural vitreous syndrome (related but different complication)