Neurological Eye Disorders: Inpatient Reimbursement Overview

DRG 123 addresses inpatient care for neurological eye disorders such as optic neuropathies, neuro-ophthalmic syndromes, and intracranial conditions presenting with visual impairment. Accurate grouping matters for inpatient reimbursement because the Diagnosis-Related Group assignment drives Medicare payment based on clinical complexity and resource consumption.

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DRG 123 Overview

DRG 123 covers inpatient admissions for primary neurological disorders affecting the visual system, including optic nerve diseases, neuro-ophthalmic syndromes, and related intracranial processes that primarily present with visual dysfunction. These cases often require neurologic and ophthalmologic evaluation, neuroimaging, and sometimes surgical or interventional procedures. The Diagnosis-Related Group groups patients by clinical similarity and resource use, which determines Medicare payment for the inpatient stay. Correct classification affects reimbursement and hospital case-mix reporting.

Clinical Trials

Acute neuro-ophthalmic intervention trials: randomized or pragmatic trials testing the efficacy and safety of time-sensitive interventions for acute neurologic causes of vision loss or eye movement disorders (for example, evaluating thrombolytic timing, neuroprotective strategies, or endovascular approaches in patients with ischemic events impacting visual pathways). These studies enroll hospitalized adults presenting with sudden visual field deficits, diplopia, or cranial nerve palsies to determine short-term neurologic and visual outcomes and complication rates. Results inform inpatient treatment algorithms and resource utilization decisions, helping providers optimize acute care pathways and payers anticipate costs associated with high-intensity interventions and length of stay.
Comparative effectiveness and diagnostic strategy studies: prospective cohort studies or randomized comparative trials that evaluate different diagnostic modalities, medical therapies, or timing of specialist consultation for subacute neurologic eye disorders such as optic neuritis, myasthenia gravis with ocular involvement, or compressive optic neuropathies. These trials focus on hospitalized or recently admitted patients who require imaging, electrophysiology, laboratory evaluation, or initiation of immunomodulatory therapies, comparing outcomes like time to diagnosis, visual recovery, readmission rates, and adverse events. Findings are relevant to hospitals and payers because they can identify which diagnostic pathways and treatment approaches yield better outcomes with lower downstream costs and reduced unnecessary testing.
Post-discharge outcomes and rehabilitation studies: longitudinal observational studies or interventional trials examining recovery trajectories, outpatient rehabilitation strategies, and long-term health service utilization for patients discharged after neurologic eye events (e.g., ischemic optic neuropathy, cranial neuropathies, or postsurgical visual complications). These studies enroll patients transitioning from inpatient to outpatient care to assess functional vision, quality of life, adherence to follow-up, and rates of rehospitalization or specialist visits, and may test models like early outpatient neuro-ophthalmology follow-up or integrated vision rehabilitation programs. Results guide care coordination practices and bundled-payment planning by providers and payers, highlighting interventions that reduce readmissions, improve functional outcomes, and optimize post-discharge resource allocation.

Related Codes

113-ORBITAL-PROCEDURES-WITH-CC-MCC

Orbital Procedures with CC/MCC: Inpatient Reimbursement Overview

114-ORBITAL-PROCEDURES-WITHOUT-CC-MCC

Orbital Procedures without CC/MCC: Inpatient Reimbursement Overview

115-EXTRAOCULAR-PROCEDURES-EXCEPT-ORBIT

Extraocular Procedures Except Orbit: Inpatient Reimbursement Overview

116-INTRAOCULAR-PROCEDURES-WITH-CC-MCC

Intraocular Procedures with CC/MCC: Inpatient Reimbursement Overview

117-INTRAOCULAR-PROCEDURES-WITHOUT-CC-MCC

Intraocular Procedures without CC/MCC: Inpatient Reimbursement Overview

121-ACUTE-MAJOR-EYE-INFECTIONS-WITH-CC-MCC

Acute Major Eye Infections with CC/MCC: Inpatient Reimbursement Overview

122-ACUTE-MAJOR-EYE-INFECTIONS-WITHOUT-CC-MCC

Acute Major Eye Infections without CC/MCC: Inpatient Reimbursement Overview

124-OTHER-DISORDERS-OF-THE-EYE-WITH-MCC-OR-THROMBOLYTIC-AGENT

Other Disorders of the Eye with MCC or Thrombolytic Agent: Inpatient Reimbursement Overview

125-OTHER-DISORDERS-OF-THE-EYE-WITHOUT-MCC

Other Disorders of the Eye without MCC: Inpatient Reimbursement Overview

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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Clinical Trials

Acute neuro-ophthalmic intervention trials: randomized or pragmatic trials testing the efficacy and safety of time-sensitive interventions for acute neurologic causes of vision loss or eye movement disorders (for example, evaluating thrombolytic timing, neuroprotective strategies, or endovascular approaches in patients with ischemic events impacting visual pathways). These studies enroll hospitalized adults presenting with sudden visual field deficits, diplopia, or cranial nerve palsies to determine short-term neurologic and visual outcomes and complication rates. Results inform inpatient treatment algorithms and resource utilization decisions, helping providers optimize acute care pathways and payers anticipate costs associated with high-intensity interventions and length of stay.
Comparative effectiveness and diagnostic strategy studies: prospective cohort studies or randomized comparative trials that evaluate different diagnostic modalities, medical therapies, or timing of specialist consultation for subacute neurologic eye disorders such as optic neuritis, myasthenia gravis with ocular involvement, or compressive optic neuropathies. These trials focus on hospitalized or recently admitted patients who require imaging, electrophysiology, laboratory evaluation, or initiation of immunomodulatory therapies, comparing outcomes like time to diagnosis, visual recovery, readmission rates, and adverse events. Findings are relevant to hospitals and payers because they can identify which diagnostic pathways and treatment approaches yield better outcomes with lower downstream costs and reduced unnecessary testing.
Post-discharge outcomes and rehabilitation studies: longitudinal observational studies or interventional trials examining recovery trajectories, outpatient rehabilitation strategies, and long-term health service utilization for patients discharged after neurologic eye events (e.g., ischemic optic neuropathy, cranial neuropathies, or postsurgical visual complications). These studies enroll patients transitioning from inpatient to outpatient care to assess functional vision, quality of life, adherence to follow-up, and rates of rehospitalization or specialist visits, and may test models like early outpatient neuro-ophthalmology follow-up or integrated vision rehabilitation programs. Results guide care coordination practices and bundled-payment planning by providers and payers, highlighting interventions that reduce readmissions, improve functional outcomes, and optimize post-discharge resource allocation.

Related Codes

113-ORBITAL-PROCEDURES-WITH-CC-MCC

Orbital Procedures with CC/MCC: Inpatient Reimbursement Overview

114-ORBITAL-PROCEDURES-WITHOUT-CC-MCC

Orbital Procedures without CC/MCC: Inpatient Reimbursement Overview

115-EXTRAOCULAR-PROCEDURES-EXCEPT-ORBIT

Extraocular Procedures Except Orbit: Inpatient Reimbursement Overview

116-INTRAOCULAR-PROCEDURES-WITH-CC-MCC

Intraocular Procedures with CC/MCC: Inpatient Reimbursement Overview

117-INTRAOCULAR-PROCEDURES-WITHOUT-CC-MCC

Intraocular Procedures without CC/MCC: Inpatient Reimbursement Overview

121-ACUTE-MAJOR-EYE-INFECTIONS-WITH-CC-MCC

Acute Major Eye Infections with CC/MCC: Inpatient Reimbursement Overview

122-ACUTE-MAJOR-EYE-INFECTIONS-WITHOUT-CC-MCC

Acute Major Eye Infections without CC/MCC: Inpatient Reimbursement Overview

124-OTHER-DISORDERS-OF-THE-EYE-WITH-MCC-OR-THROMBOLYTIC-AGENT

Other Disorders of the Eye with MCC or Thrombolytic Agent: Inpatient Reimbursement Overview

125-OTHER-DISORDERS-OF-THE-EYE-WITHOUT-MCC

Other Disorders of the Eye without MCC: Inpatient Reimbursement Overview

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.