M1381 HCPCS Reimbursement & Benchmarks | OpenPayer

Summary & Overview

HCPCS Level II M1381: Secondary Stroke Within 5 Days of Procedure

HCPCS Level II code M1381 designates patients who experience a secondary stroke within five days of an initial procedure, such as stroke related to vasospasm after subarachnoid hemorrhage. The code is clinically significant because it captures an acute, high-risk post-procedural complication that often requires intensive inpatient care and has implications for quality measurement, case mix, and short-term outcomes. Nationally, accurate use of M1381 supports tracking of early procedural complications and informs hospital resource allocation.

Key payers referenced in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise summary of the code’s clinical context, expected site and service type, and common modifier usage where available. The publication also outlines payer coverage considerations and benchmark themes relevant to acute post-procedural cerebrovascular events.

The report provides clinical context for coding, an overview of payer handling, and indicators for where M1381 may affect service lines and inpatient utilization. Data not available in the input is clearly identified, and the material focuses on national implications for billing, monitoring, and hospital case reporting related to early secondary stroke after procedures.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareM1381HCPCS Level IIsecondary strokepost-procedural complicationinpatientneurosurgeryacute carevasospasm

Billing Code Overview

HCPCS Level II code M1381 describes patients who experience a secondary stroke (for example, a subsequent stroke that may occur with vasospasm in the setting of subarachnoid hemorrhage) within 5 days of the initial procedure. This code is used to capture a short-term, acute cerebrovascular complication occurring after an interventional or surgical procedure.

Service Type: Acute post-procedural cerebrovascular complication management

Typical Site of Service: Inpatient hospital setting, including intensive care units and acute stroke or neurosurgical wards where patients are monitored closely following a procedure that places them at risk for early recurrent stroke.

Clinical & Coding Specifications

Clinical Context

A 62-year-old female is admitted to the neurocritical care unit after an urgent endovascular coiling procedure for a ruptured anterior communicating artery aneurysm causing subarachnoid hemorrhage. On post-procedure day 2 she develops new focal left-sided weakness and decreased level of consciousness. Neuroimaging (CT and CT angiography) demonstrates new territory ischemia consistent with a secondary ischemic stroke due to symptomatic cerebral vasospasm. Endovascular therapy (e.g., intra-arterial vasodilator infusion and angioplasty) is performed within 5 days of the initial aneurysm procedure to restore cerebral perfusion.

Typical clinical workflow:

Initial presentation, diagnosis, and urgent aneurysm repair (surgical clipping or endovascular coiling).
Post-procedure neurocritical monitoring with serial neurologic exams and transcranial Dopplers.
Recognition of clinical deterioration or imaging changes suggestive of secondary ischemic stroke within 5 days.
Diagnostic angiography to confirm vasospasm and decision for endovascular intervention.
Procedural billing using the HCPCS Level II code M1381 to denote care related to a secondary stroke within 5 days of the initial procedure, alongside procedure-specific CPT codes, anesthesia, and facility charges.
Post-procedure imaging, critical care management, and rehabilitation planning.

Coding Specifications

HCPCS Level II M1435: Patient on Oral Chemotherapy

HCPCS-M1309-PALLIATIVE-CARE-SERVICES-MEASUREMENT-PERIOD

HCPCS M1309: Palliative Care Services During Measurement Period

HCPCS-M1431-TELEHEALTH-ENCOUNTER

HCPCS Level II M1431: Telehealth Encounters

HCPCS-M1173-TD-TDAP-IMMUNIZATION-GAP

HCPCS M1173: Td/Tdap Immunization Gap Identified

HCPCS-M1305-PNEUMOCOCCAL-VACCINE-ADULT-IMMUNIZATION

HCPCS Level II M1305: Adult Pneumococcal Vaccination

HCPCS-M1297-BMI-NOT-DOCUMENTED-MEDICAL-REASON-OR-PATIENT-REFUSAL

HCPCS M1297: BMI Not Documented Due to Medical Reason or Patient Refusal

HCPCS-M1351-SUICIDE-SAFETY-PLAN-INITIATION-AND-REVIEW

HCPCS M1351: Suicide Safety Plan Initiation and Follow-up

HCPCS-M1284-INSTITUTIONAL-SNP-LONG-TERM-CARE-66-PLUS

HCPCS M1284: Institutional SNP or Long-Term Care Residency, Age 66+

HCPCS-M1219-ANAPHYLAXIS-VACCINE-REACTION-ENCOUNTER

HCPCS Level II M1219: Anaphylaxis Due to Vaccine on or Before Encounter Date

HCPCS-M1493-FALLS-NOT-PERFORMED-MEDICAL-REASON-DOCUMENTATION

HCPCS M1493: Documentation of Falls Not Performed Due to Medical Reasons

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Taxonomy Code	Specialty	Notes
`2084P0800X`	Neurological Surgery	Cerebrovascular neurosurgeons perform clipping and complex neurovascular interventions.
`2085R0200X`	Vascular Neurology	Neurointensivists and vascular neurologists manage secondary stroke and vasospasm medically and diagnostically.
`261QM0800X`	Interventional Neuroradiology	Interventional neuroradiologists perform diagnostic angiography and endovascular vasospasm treatments.
`363L00000X`	Radiology	Diagnostic and interventional radiologists involved in imaging and endovascular procedures.
`163WL0500X`	Critical Care Medicine	Neurocritical care physicians manage peri-procedural critical care and monitoring.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I60.0`	Subarachnoid hemorrhage from carotid siphon and bifurcation	Represents ruptured aneurysm etiologies that can lead to vasospasm and secondary stroke.
`I60.8`	Other nontraumatic subarachnoid hemorrhage	Captures other anatomic sources of SAH associated with vasospasm risk.
`I63.9`	Cerebral infarction, unspecified	Secondary ischemic stroke diagnosis when specific territory is not yet specified after deterioration.
`I67.84`	Cerebral vasospasm	Directly describes vasospasm as a cause of secondary ischemia after subarachnoid hemorrhage.
`I61.9`	Intracerebral hemorrhage, unspecified	Relevant when hemorrhagic complications coexist or are part of the initial hemorrhagic presentation.
`G45.9`	Transient cerebral ischemic attack, unspecified	Used for transient ischemic deficits in the peri-procedural period when infarction is not confirmed.
`T81.4XXA`	Infection following a procedure, initial encounter	Included to capture post-procedural infectious complications that may complicate management (use cautiously with appropriate documentation).

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`61624`	Transcatheter embolization or occlusion of intracranial aneurysm, with coil; initial vessel	Often performed during the initial aneurysm repair preceding events coded with `M1381`.
`61641`	Endovascular intracranial repair of arteriovenous malformation or dural fistula; with embolization	May be used when concomitant vascular lesions require endovascular management in the same setting.
`61645`	Cerebral angiography, diagnostic, including bilateral injections when performed; with superselective catheterization (each vessel)	Diagnostic angiography used to identify vasospasm and guide therapy for secondary stroke.
`61656`	Endovascular therapeutic intracranial angioplasty or intra-arterial thrombolysis/vasodilator infusion	Commonly performed to treat symptomatic vasospasm causing secondary stroke within 5 days of the index procedure.
`99152`	Moderate sedation services provided by the physician or other qualified healthcare professional, initial 15 minutes	May be billed when moderate sedation is provided during endovascular procedures for vasospasm treatment.
`01402`	Anesthesia for intracranial procedures	Anesthesia codes are billed when general or monitored anesthesia care is provided for neurointerventional procedures related to secondary stroke management.

`22`	Increased procedural services	Use when services are substantially greater than typical for the procedure (e.g., prolonged endovascular time for complex vasospasm treatment).
`23`	Unusual anesthesia	Use when general anesthesia is required for an otherwise normally local or monitored case due to patient condition.
`52`	Reduced services	Use when the service provided is partially reduced or discontinued.
`53`	Discontinued procedure	Use when the procedure is started but halted due to clinical instability or change in condition.
`54`	Surgical care only	Use when billing excludes post-operative management (another provider manages recovery).
`55`	Postoperative management only	Use when only the post-op care is billed by a provider different from the surgeon.
`56`	Preoperative management only	Use when only the pre-op work is billed by a provider separate from the surgeon.
`62`	Two surgeons	Use when two surgeons of different specialties work together as primary surgeons on complex cerebrovascular cases.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery	Use when an advanced practice provider assists during the procedure.
`FX`	Split (multiple) family	Use for services provided in a shared/split billing arrangement when applicable.

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