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HCPCS Level II M1112: Documentation of Degenerative Neurological Diagnosis

HCPCS Level II code M1112 denotes documentation that a patient has a degenerative neurological condition—examples include amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), or Parkinson’s disease—recorded at any time before or during an episode of care. Nationally, clear documentation of such diagnoses is important for care coordination, care planning, coverage determinations, and quality measurement where chronic neurological conditions influence service needs. Key payers relevant to this code include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. This publication explains the clinical intent and administrative role of HCPCS Level II code M1112, the typical service context (ambulatory neurology, home health, and outpatient settings), and what stakeholders commonly review when this code appears on claims. Readers will find concise guidance on: the clinical context for using the code; typical sites of service and service types tied to diagnosis documentation; payer relevance and coverage context for major national payers; and notes on where input data are not available. Data not available in the input is noted where applicable.

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Billing Code Overview

HCPCS Level II code M1112 documents that a patient has a diagnosis of a degenerative neurological condition such as amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), or Parkinson's disease diagnosed at any time before or during the episode of care. This code is used to record clinical documentation of a chronic, progressive neurological diagnosis when such information is relevant to care planning and service delivery.

Service type: Documentation of neurological diagnosis for care management and care planning
Typical site of service: Ambulatory clinic, neurology practice, home health, or other outpatient care settings where diagnosis documentation informs the episode of care

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HCPCS Level II M1112: Documentation of Degenerative Neurological Diagnosis

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Get alerted when payer policies referencing M1112 are released or updated.

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Billing Code Overview

Service type: Documentation of neurological diagnosis for care management and care planning
Typical site of service: Ambulatory clinic, neurology practice, home health, or other outpatient care settings where diagnosis documentation informs the episode of care

Clinical & Coding Specifications

Clinical Context

A typical patient is a 58-year-old individual with progressive motor symptoms referred to a home health agency for supportive services after diagnosis of a degenerative neurological condition such as amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), or Parkinson disease. The agency documents presence of the degenerative neurological diagnosis in the patient’s medical record to establish eligibility for care models or specialized equipment and to support care planning. Clinical workflow includes verification of prior neurologist or hospital documentation of the diagnosis, review of the history and neurologic findings, reconciliation of medications (antispasmodics, disease-modifying therapies, dopaminergic agents), and recording the diagnosis in the home health certification/recertification or episode record. Typical interactions occur in the patient’s residence, assisted living, or long-term care facility and involve communication with the treating neurologist, primary care provider, and payer case managers (e.g., Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, Medicare). Documentation supports care planning for mobility aids, therapy referrals (physical, occupational, speech), durable medical equipment, and safety interventions during the episode of care.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	When work or resources substantially exceed typical for documentation or extensive evaluation linked to the diagnosis
`23`	Unusual anesthesia	When anesthesia is required for an unusual circumstance related to diagnostic procedures in a patient with a neurodegenerative disorder
`52`	Reduced services	When the full service is not performed but some elements are completed due to patient condition
`53`	Discontinued procedure	When a planned procedure is terminated for safety reasons related to progressive neurological disease
`54`	Surgical care only	When only the surgeon’s portion of a multi-provider service is billed
`55`	Postoperative management only	When only post-op care is billed separate from the operative service
`56`	Preoperative management only	When only pre-op evaluation is billed prior to a subsequent operative service
`62`	Two surgeons	When two surgeons with distinct roles participate in a complex intervention related to the neurologic diagnosis
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services for Part B services furnished in a facility	When an APP provides the billed portion of evaluation or management tied to the diagnosis in a facility setting
`CO`	Occupational therapy	When occupational therapy services are provided and billed separately in relation to functional deficits from the diagnosis

Taxonomy Code	Specialty	Notes
`207P00000X`	Physical Therapist	Commonly provides mobility, gait training, and strengthening for patients with ALS, MS, or Parkinson disease
`263RM0500X`	Rehabilitation Physician (PM&R)	Manages rehabilitation plans, durable medical equipment needs, and functional assessments
`2084P0800X`	Neurology	Diagnoses and manages disease-specific therapies and progression monitoring
`367A00000X`	Nurse Practitioner	Frequently documents home-based assessments, medication reconciliation, and care coordination
`363L00000X`	Occupational Therapist	Evaluates activities of daily living and recommends adaptive equipment

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G12.21`	Amyotrophic lateral sclerosis	Primary diagnosis when documenting ALS to support care planning and eligibility for supportive services
`G35`	Multiple sclerosis	Common degenerative central nervous system diagnosis requiring therapy and home health services
`G20`	Parkinson disease	Parkinson disease leads to mobility and safety needs documented during the episode of care
`R25.2`	Cramp and spasm	Symptom code reflecting spasticity or muscle cramps seen in neurodegenerative conditions and relevant to therapy and medication management
`R26.89`	Other abnormalities of gait and mobility	Used to document functional impairment driving therapy and equipment recommendations
`Z96.649`	Presence of other functional implants, devices and grafts	May be used when documenting implanted devices (e.g., intrathecal pumps) relevant to ongoing care planning
`Z79.899`	Other long term (current) drug therapy	Captures chronic use of disease-modifying or symptomatic medications associated with these diagnoses

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97161`	Physical therapy evaluation: low complexity	Initial PT assessment for mobility limitations associated with a degenerative neurologic diagnosis; often performed after documentation of diagnosis
`97162`	Physical therapy evaluation: moderate complexity	Used when the patient requires moderate-complexity PT assessment tied to motor deficits from ALS, MS, or Parkinson disease
`97165`	Occupational therapy evaluation: high complexity	OT assessment for complex activity-of-daily-living deficits and adaptive equipment needs related to the diagnosis
`99497`	Advance care planning including the explanation and discussion of advance directives, first 30 minutes	Often provided for progressive neurologic diagnoses to document goals of care discussions during the episode of care
`G0511`	Home health assessment face-to-face encounter for homebound beneficiaries	Used to document face-to-face physician or non-physician practitioner encounter supporting home health certification when the degenerative neurologic diagnosis is present

HCPCS Level II M1111: Start of Episode of Care, Documentation

HCPCS-LEVEL-II-M1120-PATIENT-SELF-DISCHARGED-EARLY

HCPCS Level II M1120: Ongoing Care Not Possible Due to Patient Self-Discharge

HCPCS-M1106-START-OF-EPISODE-OF-CARE

HCPCS M1106: Start of Episode of Care

HCPCS-M1107-DEGENERATIVE-NEUROLOGICAL-DIAGNOSIS-DOCUMENTATION

HCPCS Level II M1107: Documentation of Degenerative Neurological Diagnosis

HCPCS-M1108-HOME-PROGRAM-REFERRAL-CONSULTATION-ONLY

HCPCS M1108: Ongoing Care Not Clinically Indicated; Home Program/Referral/Consult

HCPCS-M1109-ONGOING-CARE-INTERRUPTED-DUE-TO-EARLY-DISCHARGE

HCPCS M1109: Ongoing Care Interrupted Due to Early Discharge

HCPCS-M1110-EARLY-SELF-DISCHARGE-CARE-INTERRUPTED

HCPCS M1110: Ongoing Care Interrupted by Patient Self-Discharge

HCPCS-M1113-ONGOING-CARE-NOT-CLINICALLY-INDICATED-HOME-PROGRAM-REFERRAL-CONSULTATION

HCPCS M1113: Ongoing Care Not Clinically Indicated (Home Program/Referral/Consult)

HCPCS-M1114-CARE-DISCONTINUED-DUE-TO-HOSPITALIZATION-OR-SURGERY

HCPCS M1114: Care Discontinued Due to Hospitalization or Scheduled Surgery

HCPCS-M1115-PATIENT-SELF-DISCHARGE-INTERRUPTED-CARE

HCPCS M1115: Ongoing Care Interrupted by Patient Self-Discharge

Showing 1–10 of 37

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.

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Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	When work or resources substantially exceed typical for documentation or extensive evaluation linked to the diagnosis
`23`	Unusual anesthesia	When anesthesia is required for an unusual circumstance related to diagnostic procedures in a patient with a neurodegenerative disorder
`52`	Reduced services	When the full service is not performed but some elements are completed due to patient condition
`53`	Discontinued procedure	When a planned procedure is terminated for safety reasons related to progressive neurological disease
`54`	Surgical care only	When only the surgeon’s portion of a multi-provider service is billed
`55`	Postoperative management only	When only post-op care is billed separate from the operative service
`56`	Preoperative management only	When only pre-op evaluation is billed prior to a subsequent operative service
`62`	Two surgeons	When two surgeons with distinct roles participate in a complex intervention related to the neurologic diagnosis
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services for Part B services furnished in a facility	When an APP provides the billed portion of evaluation or management tied to the diagnosis in a facility setting
`CO`	Occupational therapy	When occupational therapy services are provided and billed separately in relation to functional deficits from the diagnosis

Taxonomy Code	Specialty	Notes
`207P00000X`	Physical Therapist	Commonly provides mobility, gait training, and strengthening for patients with ALS, MS, or Parkinson disease
`263RM0500X`	Rehabilitation Physician (PM&R)	Manages rehabilitation plans, durable medical equipment needs, and functional assessments
`2084P0800X`	Neurology	Diagnoses and manages disease-specific therapies and progression monitoring
`367A00000X`	Nurse Practitioner	Frequently documents home-based assessments, medication reconciliation, and care coordination
`363L00000X`	Occupational Therapist	Evaluates activities of daily living and recommends adaptive equipment

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G12.21`	Amyotrophic lateral sclerosis	Primary diagnosis when documenting ALS to support care planning and eligibility for supportive services
`G35`	Multiple sclerosis	Common degenerative central nervous system diagnosis requiring therapy and home health services
`G20`	Parkinson disease	Parkinson disease leads to mobility and safety needs documented during the episode of care
`R25.2`	Cramp and spasm	Symptom code reflecting spasticity or muscle cramps seen in neurodegenerative conditions and relevant to therapy and medication management
`R26.89`	Other abnormalities of gait and mobility	Used to document functional impairment driving therapy and equipment recommendations
`Z96.649`	Presence of other functional implants, devices and grafts	May be used when documenting implanted devices (e.g., intrathecal pumps) relevant to ongoing care planning
`Z79.899`	Other long term (current) drug therapy	Captures chronic use of disease-modifying or symptomatic medications associated with these diagnoses

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97161`	Physical therapy evaluation: low complexity	Initial PT assessment for mobility limitations associated with a degenerative neurologic diagnosis; often performed after documentation of diagnosis
`97162`	Physical therapy evaluation: moderate complexity	Used when the patient requires moderate-complexity PT assessment tied to motor deficits from ALS, MS, or Parkinson disease
`97165`	Occupational therapy evaluation: high complexity	OT assessment for complex activity-of-daily-living deficits and adaptive equipment needs related to the diagnosis
`99497`	Advance care planning including the explanation and discussion of advance directives, first 30 minutes	Often provided for progressive neurologic diagnoses to document goals of care discussions during the episode of care
`G0511`	Home health assessment face-to-face encounter for homebound beneficiaries	Used to document face-to-face physician or non-physician practitioner encounter supporting home health certification when the degenerative neurologic diagnosis is present

HCPCS Level II M1111: Start of Episode of Care, Documentation

HCPCS-LEVEL-II-M1120-PATIENT-SELF-DISCHARGED-EARLY

HCPCS Level II M1120: Ongoing Care Not Possible Due to Patient Self-Discharge

HCPCS-M1106-START-OF-EPISODE-OF-CARE

HCPCS M1106: Start of Episode of Care

HCPCS-M1107-DEGENERATIVE-NEUROLOGICAL-DIAGNOSIS-DOCUMENTATION

HCPCS Level II M1107: Documentation of Degenerative Neurological Diagnosis

HCPCS-M1108-HOME-PROGRAM-REFERRAL-CONSULTATION-ONLY

HCPCS M1108: Ongoing Care Not Clinically Indicated; Home Program/Referral/Consult

HCPCS-M1109-ONGOING-CARE-INTERRUPTED-DUE-TO-EARLY-DISCHARGE

HCPCS M1109: Ongoing Care Interrupted Due to Early Discharge

HCPCS-M1110-EARLY-SELF-DISCHARGE-CARE-INTERRUPTED

HCPCS M1110: Ongoing Care Interrupted by Patient Self-Discharge

HCPCS-M1113-ONGOING-CARE-NOT-CLINICALLY-INDICATED-HOME-PROGRAM-REFERRAL-CONSULTATION

HCPCS M1113: Ongoing Care Not Clinically Indicated (Home Program/Referral/Consult)

HCPCS-M1114-CARE-DISCONTINUED-DUE-TO-HOSPITALIZATION-OR-SURGERY

HCPCS M1114: Care Discontinued Due to Hospitalization or Scheduled Surgery

HCPCS-M1115-PATIENT-SELF-DISCHARGE-INTERRUPTED-CARE

HCPCS M1115: Ongoing Care Interrupted by Patient Self-Discharge

Showing 1–10 of 37

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.

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HCPCS Level II M1112: Documentation of Degenerative Neurological Diagnosis

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Billing Code Overview

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HCPCS Level II M1112: Documentation of Degenerative Neurological Diagnosis

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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