M1464 HCPCS Reimbursement & Policy Benchmarks

HCPCS Level II code M1464 denotes missing documentation of at least two attempts to follow up with a patient within 180 days of treatment. This code captures a documentation quality issue rather than a distinct clinical service; it has implications for care coordination, compliance, and administrative reviews at a national level. Clear documentation of follow-up attempts supports care continuity, quality measurement, and accurate administrative reporting.

Key payers in the national context include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an explanation of what the code represents, the typical clinical settings where this documentation expectation applies, and why consistent follow-up records matter for payers and providers. The publication outlines relevant benchmarks and reporting considerations, summarizes potential policy and billing impacts associated with documentation deficiencies, and provides clinical context about post-treatment outreach workflows.

The content is intended to inform billing managers, compliance officers, and policymakers about the code’s purpose, the operational areas affected by missing follow-up documentation, and the types of information payers may review during claims or quality assessments. Data not available in the input will be specified where applicable.

Billing Code Overview

HCPCS Level II code M1464 indicates no documentation of at least two attempts to follow up with patient within 180 days of treatment. The descriptor reflects a documentation deficiency related to post-treatment patient outreach and continuity-of-care activities.

Service type: Patient follow-up / post-treatment outreach documentation
Typical site of service: Outpatient or ambulatory care settings where follow-up contact is expected after treatment, including clinic visits, outpatient therapy, or other ambulatory treatment programs

Data not available in the input.

Clinical Context

A typical patient scenario involves an outpatient who received an episodic procedural or behavioral treatment requiring post-treatment follow-up, where the treating provider is expected to attempt outreach to the patient at least twice within 180 days after the procedure. Example: a patient undergoes an outpatient minor interventional procedure or receives a course of behavioral health intervention and fails to attend scheduled follow-up visits. Clinic staff document attempts to contact the patient by telephone and secure patient portal message at two separate dates. If documentation of a minimum of two attempts within 180 days is missing, the service is reported with code M1464 to indicate noncompliance with follow-up attempt documentation requirements.

Workflow steps:

Patient receives treatment or procedure in an outpatient clinic or ambulatory surgical center.
Clinic schedules follow-up appointments and assigns outreach tasks to nursing or administrative staff.
Staff perform follow-up attempts (phone, letter, portal message) and document each attempt in the medical record with date, method, and outcome.
If fewer than two documented attempts occur within 180 days, coding/billing staff assign M1464 per billing guidance to reflect lack of required follow-up attempt documentation.

Typical site of service: outpatient clinic, ambulatory surgical center, or behavioral health clinic.

Typical patient: adult or pediatric patients discharged after an ambulatory procedure or episodic service requiring post-procedure monitoring who do not complete or respond to scheduled follow-up contacts within the 180-day window.

Common payors: Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, Medicare.

Coding Specifications

Modifier	Description	When to Use
`24`	Unrelated evaluation and management service by the same physician during a postoperative period	Use when an unrelated E/M is provided during the global period following a procedure that requires follow-up documentation.
`25`	Significant, separately identifiable E/M service by the same physician on the same day as a procedure	Use when a distinct E/M is furnished the same day as a procedure; follow-up documentation expectations remain separate.
`57`	Decision for surgery	Use if documentation shows the visit led to the initial decision for major surgery, relevant to perioperative follow-up scheduling.
`52`	Reduced services	Use when a service was partially reduced and affects expected follow-up planning or documentation.
`58`	Staged or related procedure by the same physician during the postoperative period	Use when a planned subsequent procedure occurs and follow-up attempts are part of staged care.
`76`	Repeat procedure or service by same physician	Use when a procedure is repeated and follow-up outreach is required after each occurrence.
`77`	Repeat procedure by another physician	Use when a different physician repeats the service and separate follow-up documentation is needed.
`90`	Reference (external) laboratory	Use when external lab results drive additional follow-up attempts documented in the record.
`PN`	Noncovered item or service by payer-specific modifier	Use when a payer requires notation that follow-up attempts relate to a noncovered service (payer-specific guidance applies).
`GA`	Waiver of liability statement on file (payer acceptance varies)	Use when patient signed an advance notice, potentially affecting follow-up obligation documentation.

Taxonomy Code	Specialty	Notes
`207Q00000X`	Family Medicine	Primary care physicians commonly coordinate follow-up after ambulatory procedures.
`207R00000X`	Internal Medicine	Internists manage post-procedure follow-up for medical and procedural patients.
`208D00000X`	General Surgery	Surgeons perform procedures requiring postoperative follow-up attempts to be documented.
`208U00000X`	Surgical Oncology	Specialists performing staged procedures with mandated follow-up documentation.
`101Y00000X`	Behavioral Health Care Provider	Behavioral health clinicians performing episodic treatments that require documented outreach.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Z48.89`	Encounter for other specified aftercare	Commonly used for routine post-procedural follow-up where follow-up attempt documentation is expected.
`Z09`	Encounter for follow-up examination after completed treatment for conditions other than malignant neoplasm	Relevant when follow-up visits are scheduled after treatment completion and attempts must be documented.
`Z91.1`	Patient's noncompliance with medical treatment and regimen, not elsewhere classified	May be used when a patient does not respond to documented outreach attempts; documentation of attempts is necessary.
`Z02.89`	Encounter for administrative examinations, other specified administrative examinations	Used for administrative follow-up encounters and outreach documentation.
`R68.89`	Other general symptoms and signs	Used when nonspecific symptoms prompt outreach; follow-up attempt documentation still required.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`99024`	Postoperative follow-up visit global surgical package, included in global period	Often used to document routine post-op visits that, when not performed or not documented adequately (including follow-up attempts), may trigger reporting of `M1464` for missing attempt documentation.
`99358`	Prolonged evaluation and management service before and/or after direct patient care; first hour	May be used for extended care coordination activities including outreach attempts when properly documented as E/M time.
`99490`	Chronic care management services, first 20 minutes of clinical staff time directed by a physician or other qualified health care professional, per calendar month	Used for ongoing care management where outreach and attempts to contact the patient are part of monthly care; missing documentation of attempts may relate to `M1464` reporting.
`99487`	Complex chronic care management services, first hour of clinical staff time directed by a physician or other qualified health care professional, per calendar month	Applies when complex care requires multiple documented outreach attempts; lack of documentation connects to `M1464`.
`99091`	Collection and interpretation of physiologic data digitally stored and/or transmitted by the patient and/or caregiver to the physician or other qualified health care professional	When remote monitoring triggers follow-up attempts that must be documented; absence of at least two attempts within 180 days is indicated by `M1464`.
`99050`	Services provided in the office at times other than regularly scheduled office hours, or days when the office is normally closed	Used for additional outreach or follow-up encounters outside normal hours; documentation of these attempts impacts `M1464` applicability.

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Summary & Overview

HCPCS Level II M1464: Missing Documentation of Follow-Up Attempts