Summary & Overview

HCPCS Level II S5100: Adult Day Care Services, per 15 Minutes

HCPCS Level II code S5100 represents adult day care services billed in 15-minute increments. Nationally, this code captures time-based supportive and custodial services provided in adult day care settings, an important segment of long-term services and supports that helps maintain community-based care for older adults and individuals with disabilities. Use of S5100 has implications for care coordination, managed long-term care benefit design, and provider reimbursement models.

Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical context and typical service setting, benchmarks for common billing practices where available, relevant policy considerations affecting coverage and billing for adult day services, and guidance on modifier usage patterns and payer expectations when data is present. The publication also outlines gaps where data is not available and directs readers to additional resources for claims editing and compliance. This summary provides payers, provider billing staff, and policy analysts with a national-level reference for understanding how S5100 is used and managed across major commercial and public payers.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareS5100HCPCS Level IIadult day caretime-based billinglong-term services and supportsday services facilityambulatory care billing

Billing Code Overview

HCPCS Level II code S5100 describes day care services for adults billed per 15 minutes. The service type is day care services, adult, and the typical site of service is adult day care or day services facility where ongoing supervision, socialization, and supportive care are provided during daytime hours.

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A 68-year-old adult enrolled in a day care adult services program attends a medically supervised therapeutic day program for socialization, nursing observation, medication administration, and rehabilitative activity. The participant arrives for scheduled daytime services and is signed in; nursing staff document arrival time and baseline vital signs. Services provided in 15-minute increments include symptom monitoring, medication administration, wound checks, supervised therapeutic group activities, and short-term hands-on assistance for activities of daily living. The clinical workflow: intake assessment by a nurse or social worker; individualized plan of care that identifies needed interventions; delivery of services in 15-minute units by licensed nurses, therapists, or trained aides under supervision; documentation of start/stop times and clinical findings in the medical record; periodic reassessments and communication with the participant’s primary care provider or referring clinician; discharge from the day program at the end of the session with a summary of care delivered and any follow-up recommended.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier — standard service	Use when no special circumstance applies to the billed unit of day care service.
`22`	Increased procedural services	Use when documented work or intensity substantially exceeds usual for a session (rare for routine day care; requires documentation).
`23`	Unusual anesthesia	Use if unusual anesthesia is required for a procedure provided as part of the day care session (rare).
`52`	Reduced services	Use when the service was partially reduced or not provided as originally planned, with documentation of why.
`53`	Discontinued procedure	Use when the day care service session or specific planned intervention was started but discontinued due to patient instability or other valid reason.
`54`	Surgical care only	Not typically used for routine day care but applicable if surgical intra-day care is billed separately.
`55`	Postoperative management only	Use if only post-op management occurred during the day care visit and separate surgical coding applies.
`56`	Preoperative management only	Use if only pre-op management was furnished during the day care visit.
`62`	Two surgeons	Use if two qualified practitioners concurrently provide separate services during the same day care unit and reporting rules require attribution.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services for Medicare reporting (PA/NP)	Use when the service is furnished by these clinician types and payer requires the AS modifier for identification.
`CO`	Child or youth services modifier (payer-specific)	Use if a payer requires a child/youth modifier when adults under specific benefit rules are treated (payer-specific application).
`CQ`	Service furnished by a registered nurse in critical access hospital or rural health clinic (payer-specific reporting)	Use when payer policy requires to indicate RN-delivered services in specific settings.
`FX`	Service by clinical staff without direct supervision (payer-specific)	Use to denote services furnished by clinical staff under general supervision when payer requires this indicator.
`QX`	Service furnished under the supervision of a physician by a PA (Medicare identification)	Use when a physician-supervised PA provides the billed portion of day care services and payer requires this modifier.

Taxonomy Code	Specialty	Notes
`163W00000X`	Nursing (Registered Nurse)	RNs commonly perform assessments, medication administration, and documentation in adult day care.
`367A00000X`	Social Work	Social workers coordinate care plans, community resources, and psychosocial interventions.
`208000000X`	Physical Therapy	Physical therapists provide rehabilitative activities and mobility training as part of day programming.
`208D00000X`	Occupational Therapy	OTs address activities of daily living, adaptive strategies, and functional interventions.
`364S00000X`	Nursing Assistant / Home Health Aide	Trained aides provide supervised ADL assistance and monitoring under licensed staff direction.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`F03.90`	Unspecified dementia, uncomplicated	Dementia is a common reason for adult day care services for supervision, cognitive stimulation, and safety monitoring.
`F01.50`	Vascular dementia without behavioral disturbance	Vascular cognitive impairment often requires structured day care for rehabilitation and monitoring of vascular risk factors.
`I10`	Essential (primary) hypertension	Hypertension is common comorbidity requiring medication management and monitoring during day care sessions.
`E11.9`	Type 2 diabetes mellitus without complications	Diabetes management, glucose monitoring, and medication administration are frequently provided in adult day care.
`Z91.82`	History of falling	Patients with fall history attend day programs for supervised mobility training and fall risk reduction.
`M62.81`	Muscle weakness (generalized)	Functional impairment due to weakness often prompts therapy and supervised activity within day care.
`F32.A`	Depression, unspecified	Behavioral health interventions and socialization in day care support mood disorders and reduce isolation.
`R26.2`	Difficulty in walking, not elsewhere classified	Day care programs commonly address gait instability with therapies and supervision.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97530`	Therapeutic activities, direct (one-on-one) patient contact by the provider, each 15 minutes	Used when individualized therapeutic activity or functional training is provided during a day care session; billed in 15-minute units alongside day care reporting when payer allows separate therapy billing.
`90853`	Group psychotherapy (other than of a multiple-family group)	Applicable for structured group behavioral health or social skills sessions provided within an adult day care program.
`99211`	Office or other outpatient visit for the evaluation and management of an established patient that may not require the presence of a physician, typically 5 minutes	Used for brief clinician visits within the day care setting for minor problems; may be used by nurse practitioners or physician assistants when evaluating participants.
`G0156`	Services performed by a qualified physical or occupational therapist in the home health or day care setting under a plan of care, per 15 minutes (Medicare historic code)	Used historically for therapy units provided in non-traditional sites; check current payer policies for accepted equivalents when billing therapy delivered during day care.
`99324`	Domiciliary, rest home, or custodial care services, new or established patient; per day	Related for custodial-oriented services when day care focuses on social and custodial care needs; used only when payer allows and clinical criteria match.