HCPCS M1331: Re-evaluation Within Eight Weeks - OpenPayer

Summary & Overview

HCPCS M1331: Re-evaluation Within Eight Weeks

HCPCS Level II code M1331 denotes a documented re-evaluation performed no later than eight weeks after an initial evaluation. This code captures timely follow-up assessments that confirm whether a patient’s condition and the initial plan of care are progressing as expected. Nationally, use of M1331 matters because it reflects adherence to care continuity and appropriate monitoring after an initial assessment, which can influence quality reporting, utilization patterns, and payer reviews.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical context, typical sites of service, and common billing modifiers associated with follow-up evaluations. The publication summarizes how M1331 is used in practice, presents benchmark considerations where available, and outlines documentation elements that commonly support billing for re-evaluation services. This national-level summary is intended to clarify the code’s purpose and operational considerations for billing, coding, and compliance staff.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareM1331HCPCS Level IIre-evaluationfollow-up visitoutpatient caredocumentationbilling policyquality measures

Billing Code Overview

HCPCS Level II code M1331 indicates that a patient who was appropriately evaluated during an initial examination received a documented re-evaluation no later than eight weeks after that initial exam. The service represented is a timely follow-up re-evaluation to assess progress or response to an earlier evaluation and any initiated plan of care.

Service type: Re-evaluation visit following an initial exam
Typical site of service: Outpatient clinic or ambulatory care setting where follow-up evaluations are performed

Clinical & Coding Specifications

Clinical Context

A 56-year-old patient presents for an initial orthopedic evaluation of persistent low back pain after a work-related strain. The clinician documents a comprehensive history, focused musculoskeletal and neurologic exam, and orders baseline imaging. Treatment is initiated with conservative measures (activity modification, physical therapy referral, and non-opioid analgesics). The patient returns for a required re-evaluation within eight weeks to assess response to treatment, document changes in pain, functional status, objective exam findings, any new imaging results, and to determine next steps (continued conservative care, escalation to interventional procedures, or referral to a specialist).

Typical clinical workflow:

Referral or self-presentation for initial evaluation.
Initial face-to-face comprehensive exam with documentation of history, exam, assessment, and plan.
Initiation of treatment and scheduling of follow-up within eight weeks.
Re-evaluation visit within eight weeks documenting interval history, response to treatment, objective findings, decision-making, and any changes in plan.

Typical site of service: outpatient clinic, ambulatory surgical center follow-up, or hospital outpatient department.

Typical patient scenario: adult with musculoskeletal complaint (e.g., low back pain, neck pain, shoulder strain) who requires short-term re-evaluation to document improvement or need for further intervention.

Coding Specifications

Modifier

HCPCS Level II M1278: Elevated Blood Pressure with Documented Follow-Up

HCPCS-M1344-MISSING-BASELINE-OR-FOLLOWUP-PAM-SCORE

HCPCS M1344: Missing Baseline or Follow-up Patient Activation Measure

HCPCS-M1394-STAGES-1-3-BREAST-CANCER-ONCOLOGY-CARE

HCPCS M1394: Stages I–III Breast Cancer

HCPCS-M1501-PATHOLOGY-MIPS-VALUE-PATHWAY

HCPCS M1501: Pathology MIPS Value Pathway

HCPCS-M1178-DOCUMENTATION-PNEUMOCOCCAL-VACCINE-EXEMPTION

HCPCS M1178: Documentation of Medical Reason Not to Administer Pneumococcal Vaccine

HCPCS-M1243-PATIENT-FELT-HEARD-UNDERSTOOD

HCPCS Level II M1243: Patient-Reported Feeling Heard and Understood

HCPCS-M1169-INFLUENZA-VACCINE-MEDICAL-EXEMPTION-DOCUMENTATION

HCPCS M1169: Documentation of Medical Reason for Not Administering Influenza Vaccine

HCPCS-M1201-MEDICAL-REASON-NO-ACEI-OR-ARB

HCPCS M1201: Documentation of Medical Reason for Not Prescribing ACE-i/ARB Therapy

HCPCS-LEVEL-II-M1300-INFLUENZA-IMMUNIZATION-NOT-ADMINISTERED

HCPCS Level II M1300: Influenza Immunization Not Administered

HCPCS-M1210-HIGH-RISK-MEDICATION-ORDERS-NOT-ORDERED

HCPCS M1210: At Least Two High-Risk Medication Orders Not Ordered

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Taxonomy Code	Specialty	Notes
`208000000X`	Orthopedic Surgery	Common specialty for evaluation and re-evaluation of musculoskeletal complaints.
`207P00000X`	Physical Medicine & Rehabilitation	Common for non-operative management and functional re-assessment.
`207L00000X`	Pain Medicine	Involved when escalation to interventional pain management is considered.
`207R00000X`	Physical Therapy	Provides therapeutic treatments and documents functional progress at re-evaluation.
`207K00000X`	Family Medicine	Primary care management and short-term follow-up for common musculoskeletal problems.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M54.5`	Low back pain	Common presenting diagnosis requiring initial evaluation and re-evaluation to monitor response to conservative care.
`M25.511`	Pain in right shoulder	Frequently evaluated and re-evaluated after conservative measures or interventions.
`M25.512`	Pain in left shoulder	Same relevance for contralateral shoulder pain management and follow-up.
`S39.012A`	Strain of muscle, fascia and tendon of lower back, initial encounter	Acute strain that requires short-term re-evaluation to document recovery.
`M54.2`	Cervicalgia	Neck pain that often follows a similar workflow of initial assessment and re-evaluation within weeks.
`M75.100`	Unspecified rotator cuff tear or rupture of unspecified shoulder, not specified as traumatic	Shoulder pathology that may be monitored after conservative care and re-evaluated for escalation.
`M54.16`	Radiculopathy, thoracic region	Neuropathic referral symptoms that warrant reassessment for progression or need for imaging/intervention.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`99204`	Office or other outpatient visit for the evaluation and management of a new patient, typically 45 minutes	May represent the initial comprehensive evaluation visit preceding the re-evaluation within eight weeks.
`99214`	Office or other outpatient visit for the evaluation and management of an established patient, typically 25 minutes	Common code for the re-evaluation visit within eight weeks when moderate complexity decision-making is documented.
`97110`	Therapeutic exercises to develop strength and endurance, range of motion and flexibility	Frequently ordered between the initial visit and re-evaluation as part of conservative care.
`72020`	Radiologic examination, spine, single view	Imaging frequently obtained at or between visits to document structural findings relevant to re-evaluation.
`20552`	Injection(s); single tendon sheath, or ligament, aponeurosis (e.g., trigger point injections)	Procedure that may follow re-evaluation if conservative therapy fails and targeted injection is indicated.

`22`	Increased procedural services	When work required is substantially greater than normally required for the service, with documentation of why.
`23`	Unusual anesthesia	When an anesthesia service is medically necessary for a procedure that usually does not require general anesthesia.
`52`	Reduced services	When the service performed is partially reduced or eliminated; document limitations.
`53`	Discontinued procedure	When the procedure is started but discontinued due to extenuating circumstances.
`54`	Surgical care only	When the surgeon provides only the surgical portion; postoperative care billed by another provider.
`55`	Postoperative management only	When the surgeon provides only postoperative management.
`56`	Preoperative management only	When the surgeon provides only the preoperative evaluation and management.
`62`	Two surgeons	When two surgeons work together as primary surgeons performing distinct portions of a procedure.
`AS`	Ambulatory surgical center	When the service is provided in an ambulatory surgical center setting.
`QX`	CRNA service with modifier QK	When a certified registered nurse anesthetist performs anesthesia services without medical direction.

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