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CPT 78650: Nuclear Medicine Localization of Cerebrospinal Fluid Leak

CPT code 78650 represents a diagnostic nuclear medicine study that detects and localizes cerebrospinal fluid (CSF) leakage using an injected radioactive tracer. Nationally relevant for neurology, otolaryngology, neurosurgery, and nuclear medicine practices, this code captures procedures performed when leak site localization is clinically necessary and other imaging is insufficient. Use of this code affects imaging utilization, specialist referral patterns, and payer coverage for advanced diagnostic workups.

Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides readers with an overview of typical sites of service, coding context, and payer coverage considerations. It summarizes common modifiers used with imaging services and notes when data are unavailable.

Readers will learn clinical context for when a CSF leak study is performed, how the service aligns with nuclear medicine workflows, and what to expect from payer coverage nationally. The document highlights benchmarks and policy considerations relevant to reimbursement and utilization of diagnostic nuclear imaging for CSF leak localization. Data not available in the input are clearly identified where applicable.

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Billing Code Overview

CPT code 78650 describes a diagnostic nuclear imaging procedure used to detect and localize cerebrospinal fluid (CSF) leaks by administering a radioactive tracer and imaging the distribution of the tracer over time. This study is designed to identify active CSF leakage sites when clinical evaluation or other imaging modalities are inconclusive.

Service type: Diagnostic nuclear medicine imaging
Typical site of service: Hospital outpatient imaging center or nuclear medicine department

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CPT 78650: Nuclear Medicine Localization of Cerebrospinal Fluid Leak

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Billing Code Overview

Service type: Diagnostic nuclear medicine imaging
Typical site of service: Hospital outpatient imaging center or nuclear medicine department

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult referred from neurology or otolaryngology for evaluation of suspected cerebrospinal fluid (CSF) leak after head trauma, skull base surgery, chronic rhinorrhea suspicious for CSF otorrhea/rhinorrhea, or positional headache suggesting low CSF pressure. The patient presents with clear unilateral nasal drainage that tests positive for beta-2 transferrin or with persistent post-operative drainage after transsphenoidal or skull base repair. Prior to the nuclear study, the clinical workflow commonly includes history and physical, specimen testing for beta-2 transferrin, high-resolution CT or MR imaging of the skull base, and ENT or neurosurgical consultation.

On the day of service the patient is positioned in nuclear medicine. An intrathecal injection of a radiotracer (commonly technetium-99m–labeled DTPA) is administered by an experienced provider or interventional radiology under sterile technique. Dynamic and delayed planar or SPECT images are acquired to localize tracer egress from the subarachnoid space to sinonasal or otic cavities. Results guide surgical planning or conservative management decisions; a neurosurgeon or otolaryngologist typically reviews imaging for localization of the leak and to determine the need for operative repair.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	When physician interprets and reports the nuclear images separate from the facility technical component
`TC`	Technical component	When billing only the imaging equipment, radiopharmaceutical, and technologist services
`52`	Reduced services	When the procedure is partially reduced or not fully completed
`53`	Discontinued procedure	When the procedure is started but terminated for patient safety before completion
`59`	Description	When a distinct procedural service is performed on the same day (note: `59` is not in provided list; omitted)
`78`	Return to OR for related procedure during global period	When a patient returns to operating room for complications related to an earlier procedure (less commonly applied to diagnostic nuclear studies)
`76`	Repeat procedure by same provider	When the same study is repeated later the same day (note: `76` is not in provided list; omitted)
`22`	Increased procedural services	When work required is substantially greater than typical for the procedure
`50`	Bilateral procedure	When bilateral imaging or bilateral procedures are performed (rare for this study)
`62`	Two surgeons	When two surgeons from different specialties are involved (typically for subsequent operative repair related to findings)
`80`	Assistant surgeon	When an assistant surgeon is documented during an operative procedure that follows localization
`90`	Reference (not provided) omitted to comply with list

Taxonomy Code	Specialty	Notes
2084P0800X	Neurology	Neurologists refer patients for CSF leak evaluation; may co-manage headaches or intracranial hypotension
207L00000X	Otolaryngology (ENT)	ENT commonly evaluates rhinorrhea/otorrhea and plans endoscopic repair after localization
2086S0102X	Nuclear Medicine	Nuclear medicine physicians perform, image, and interpret intrathecal radionuclide cisternography
208000000X	Diagnostic Radiology	Radiologists experienced with radionuclide procedures may participate in image interpretation
2080000001X	Neurosurgery	Neurosurgeons use localization results for operative planning and repair

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G96.0`	Cerebrospinal fluid leak	Primary indication for radionuclide cisternography to localize leak site
`S02.2XXA`	Fracture of base of skull, initial encounter	Traumatic skull base fractures may produce CSF rhinorrhea/otorrhea evaluated with this study
`G44.201`	Chronic postprocedural headache, not elsewhere classified	Headache from intracranial hypotension due to CSF leak may prompt imaging
`J34.89`	Other specified disorders of nose and nasal sinus	When persistent unilateral clear rhinorrhea of unclear origin requires CSF leak evaluation
`G93.6`	Cerebral edema (used cautiously)	Related intracranial processes may coexist; not a primary indication but occasionally coded in complex cases

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`62270`	Spinal puncture, diagnostic with or without contrast for myelography	Provides CSF access for intrathecal injection of radiotracer prior to radionuclide cisternography when performed by same or separate provider
`78999`	Unlisted diagnostic ultrasound procedure (example placeholder)	Data not applicable; follow-up or adjunct imaging codes vary by facility (note: unlisted codes are used when no specific code exists)
`70486`	CT head/face without contrast, limited to skull base	CT imaging commonly performed before or after localization to identify bone defects at the skull base
`70553`	MRI brain with and without contrast	MRI of the brain/skull base used to evaluate encephaloceles or meningocele associated with CSF leak
`61616`	Repair of CSF leak; cranial base approach	Surgical repair code used when operative repair follows localization study

CPT 78600: Brain Nuclear Diagnostic Imaging, Static Views

CPT-78601-BRAIN-NUCLEAR-PERFUSION-IMAGING-FEWER-THAN-FOUR-STATIC-VIEWS

CPT 78601: Brain Nuclear Perfusion Imaging, Fewer Than Four Static Views

CPT-78605-BRAIN-NUCLEAR-STATIC-IMAGING-FOUR-OR-MORE-VIEWS

CPT 78605: Nuclear Brain Imaging, Four or More Static Views

CPT-78606-NUCLEAR-BRAIN-IMAGING-STATIC-VIEWS-CEREBRAL-BLOOD-FLOW

CPT 78606: Nuclear Brain Imaging with Static Views and Cerebral Blood Flow

CPT-78608-PET-BRAIN-METABOLIC-IMAGING

CPT 78608: PET Brain Metabolic Imaging

CPT-78609-PET-BRAIN-IMAGING

CPT 78609: PET Brain Imaging to Assess Function and Blood Flow

CPT-78610-CEREBRAL-PERFUSION-NUCLEAR-MEDICINE-STUDY

CPT 78610: Cerebral Perfusion Study, Nuclear Medicine

CPT-78630-CSF-FLOW-STUDY-HYDROCEPHALUS-LEAK-EVALUATION

CPT 78630: Cerebrospinal Fluid Flow Study for Hydrocephalus and CSF Leak

CPT-78635-CSF-FLOW-VENTRICULAR-IMAGING-HYDROCEPHALUS

CPT 78635: CSF Flow Study for Ventricular Size Assessment

CPT-78645-CSF-SHUNT-FLOW-IMAGING

CPT 78645: Imaging to Assess Cerebrospinal Fluid Shunt Patency

Showing 1–10 of 12

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

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

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	When physician interprets and reports the nuclear images separate from the facility technical component
`TC`	Technical component	When billing only the imaging equipment, radiopharmaceutical, and technologist services
`52`	Reduced services	When the procedure is partially reduced or not fully completed
`53`	Discontinued procedure	When the procedure is started but terminated for patient safety before completion
`59`	Description	When a distinct procedural service is performed on the same day (note: `59` is not in provided list; omitted)
`78`	Return to OR for related procedure during global period	When a patient returns to operating room for complications related to an earlier procedure (less commonly applied to diagnostic nuclear studies)
`76`	Repeat procedure by same provider	When the same study is repeated later the same day (note: `76` is not in provided list; omitted)
`22`	Increased procedural services	When work required is substantially greater than typical for the procedure
`50`	Bilateral procedure	When bilateral imaging or bilateral procedures are performed (rare for this study)
`62`	Two surgeons	When two surgeons from different specialties are involved (typically for subsequent operative repair related to findings)
`80`	Assistant surgeon	When an assistant surgeon is documented during an operative procedure that follows localization
`90`	Reference (not provided) omitted to comply with list

Taxonomy Code	Specialty	Notes
2084P0800X	Neurology	Neurologists refer patients for CSF leak evaluation; may co-manage headaches or intracranial hypotension
207L00000X	Otolaryngology (ENT)	ENT commonly evaluates rhinorrhea/otorrhea and plans endoscopic repair after localization
2086S0102X	Nuclear Medicine	Nuclear medicine physicians perform, image, and interpret intrathecal radionuclide cisternography
208000000X	Diagnostic Radiology	Radiologists experienced with radionuclide procedures may participate in image interpretation
2080000001X	Neurosurgery	Neurosurgeons use localization results for operative planning and repair

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G96.0`	Cerebrospinal fluid leak	Primary indication for radionuclide cisternography to localize leak site
`S02.2XXA`	Fracture of base of skull, initial encounter	Traumatic skull base fractures may produce CSF rhinorrhea/otorrhea evaluated with this study
`G44.201`	Chronic postprocedural headache, not elsewhere classified	Headache from intracranial hypotension due to CSF leak may prompt imaging
`J34.89`	Other specified disorders of nose and nasal sinus	When persistent unilateral clear rhinorrhea of unclear origin requires CSF leak evaluation
`G93.6`	Cerebral edema (used cautiously)	Related intracranial processes may coexist; not a primary indication but occasionally coded in complex cases

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`62270`	Spinal puncture, diagnostic with or without contrast for myelography	Provides CSF access for intrathecal injection of radiotracer prior to radionuclide cisternography when performed by same or separate provider
`78999`	Unlisted diagnostic ultrasound procedure (example placeholder)	Data not applicable; follow-up or adjunct imaging codes vary by facility (note: unlisted codes are used when no specific code exists)
`70486`	CT head/face without contrast, limited to skull base	CT imaging commonly performed before or after localization to identify bone defects at the skull base
`70553`	MRI brain with and without contrast	MRI of the brain/skull base used to evaluate encephaloceles or meningocele associated with CSF leak
`61616`	Repair of CSF leak; cranial base approach	Surgical repair code used when operative repair follows localization study

CPT 78600: Brain Nuclear Diagnostic Imaging, Static Views

CPT-78601-BRAIN-NUCLEAR-PERFUSION-IMAGING-FEWER-THAN-FOUR-STATIC-VIEWS

CPT 78601: Brain Nuclear Perfusion Imaging, Fewer Than Four Static Views

CPT-78605-BRAIN-NUCLEAR-STATIC-IMAGING-FOUR-OR-MORE-VIEWS

CPT 78605: Nuclear Brain Imaging, Four or More Static Views

CPT-78606-NUCLEAR-BRAIN-IMAGING-STATIC-VIEWS-CEREBRAL-BLOOD-FLOW

CPT 78606: Nuclear Brain Imaging with Static Views and Cerebral Blood Flow

CPT-78608-PET-BRAIN-METABOLIC-IMAGING

CPT 78608: PET Brain Metabolic Imaging

CPT-78609-PET-BRAIN-IMAGING

CPT 78609: PET Brain Imaging to Assess Function and Blood Flow

CPT-78610-CEREBRAL-PERFUSION-NUCLEAR-MEDICINE-STUDY

CPT 78610: Cerebral Perfusion Study, Nuclear Medicine

CPT-78630-CSF-FLOW-STUDY-HYDROCEPHALUS-LEAK-EVALUATION

CPT 78630: Cerebrospinal Fluid Flow Study for Hydrocephalus and CSF Leak

CPT-78635-CSF-FLOW-VENTRICULAR-IMAGING-HYDROCEPHALUS

CPT 78635: CSF Flow Study for Ventricular Size Assessment

CPT-78645-CSF-SHUNT-FLOW-IMAGING

CPT 78645: Imaging to Assess Cerebrospinal Fluid Shunt Patency

Showing 1–10 of 12

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

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

OpenPayer

CPT 78650: Nuclear Medicine Localization of Cerebrospinal Fluid Leak

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Billing Code Overview

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OpenPayer

CPT 78650: Nuclear Medicine Localization of Cerebrospinal Fluid Leak

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References