Loading...

    Explore
    • Policy Monitoring
    • Live Policy Feed
    • Billing Codes
    • NPI Medicare & Medicaid
    • Healthcare Providers
    • Health Insurance Payers
    • States
    • Service Lines
    • Taxonomy Codes
    Lookup tools
    • Billing Code Lookup
    • CPT Modifier Lookup
    • Provider Taxonomy Code Lookup
    • Healthcare Provider & Facility Lookup
    • Health Insurance Payer Lookup
    • Payer Contact Directory

    Policy & Benchmark Tools

    • Prior Authorization Lookup
    • Coverage Criteria Lookup
    • Timely Filing Lookup
    • Billing Code Reimbursement Rates
    • Payer Comparison Dashboard
    • Facility Comparison Dashboard
    • All tools

    Company

    • About OpenPayer
    • Data Sources
    • Trek Health
    OpenPayerby Trek Health
    LinkedInYouTube

    © 2026 Trek Health. All rights reserved.

    OpenPayer is built and maintained by Trek Health.

    v1.0.28
    OpenPayerBilling CodesOther Psychiatric Services or ProceduresCPT cpt-90899-unlisted-psychiatric-service-procedure
    Ask Trek AI about this page

    CPT 90899: Unlisted Psychiatric Service or Procedure

    CPT code 90899 is used to report an unlisted psychiatric service or procedure when no specific CPT code exists for the clinical service provided; it typically represents customized or novel psychiatric evaluation, treatment, or procedural services delivered in outpatient behavioral health clinics, hospital psychiatric units, or other ambulatory mental health settings and is billed when documentation describes the service sufficiently to justify use of an unlisted psychiatric code.

    For related coverage guidance, see recent payer policy updates: Lumbar Microdiscectomy, Artificial Cervical Intervertebral Disc, Lumbar Decompression.

    Customize your policy alerts

    Sign up for cpt 90899 policy alerts

    Get alerted when payer policies referencing 90899 are released or updated.

    Monitor payer policy activity

    Receive email alerts as soon as relevant payer policies are published or updated.

    Table of contents

    Progress1 / 6

    Explore openpayer tools

    • Billing CodesCPT, HCPCS, DRG & more
    • Reimbursement RatesCommercial vs. Medicare rate reports
    • ProvidersHospitals & facilities
    • PayersPlans & market footprint
    • Taxonomy CodesNUCC specialty codes
    • ModifiersCPT modifiers & usage
    • Prior AuthorizationPA policies by payer & drug
    • Timely FilingFiling deadlines by payer
    • Coverage CriteriaMedical necessity by payer
    • Payer ContactsClaims, PA & appeals contacts
    View all tools

    Clinical & Coding Specifications

    Clinical Context

    A 34-year-old patient presents to an outpatient psychiatric clinic with a complex, atypical presentation of severe treatment-resistant anxiety and emerging dissociative symptoms that do not map cleanly to a single existing evaluation or therapy CPT code. The clinician is a board-certified psychiatrist in a behavioral health clinic and performs an extended, individualized psychiatric intervention combining prolonged diagnostic assessment, targeted psychotherapeutic techniques, and a novel procedural component (such as administration of an investigational neuromodulation protocol) that is not described by a specific CPT code. The visit includes a detailed history, collateral information review, medication management, extended psychotherapy, and documentation of a unique procedure performed during the encounter.

    In the clinical workflow: the patient is scheduled in advance for a longer appointment slot. Pre-visit chart review and coordination with ancillary staff occur. During the visit the psychiatrist documents medical necessity for time and complexity beyond typical codes, documents the specific activities performed that are not captured by existing CPT codes, and appends modifier 22 if unusual procedural services required increased work. If a facility or payor requires, a separate technical component or telehealth modifier (for example TC or 95) may be applied according to the service elements. Billing staff attaches a clear narrative describing the service, duration, and why no specific CPT accurately describes the care, and submits for review by the payer (for example Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, Medicare).

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    90791Psychiatric diagnostic evaluation (without medical services)Often used for initial comprehensive psychiatric evaluations; may precede an unspecified procedure billed with 90899 when additional novel elements are later performed.
    90834Psychotherapy, 45 minutes with patientCommon psychotherapy code that may represent standard therapy elements; 90899 is used when therapy includes atypical, nonstandard procedural components.
    90853Group psychotherapyMay be billed for related group therapeutic activities; distinct group services should be billed separately from an individual unspecified procedure.
    90901Biofeedback training, per session (example related procedure)When a technical neuromodulation or biofeedback component is performed and does not fit existing mental health codes, 90899 can be used for novel combined services; 90901 may be billed if appropriate and separately reportable.
    96127

    Related Modifiers

    7 rows

    ModifierDescriptionWhen to Use
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    55Modifier –55 indicates the billing provider furnished only postoperative management for a procedure that has a global surgical period. According to AAPC, this modifier is appended to the same CPT…- Use modifier -55 when billing the same CPT surgical code that has a 10- or 90-day global period and you, as a provider other than the original surgeon, furnished ONLY postoperative management (no…
    59Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
    95Modifier 95 indicates that a service was provided via synchronous, real‑time audio‑video telehealth rather than in‑person. Per CMS, AAPC and professional associations, append modifier 95 to claim…- Use modifier 95 to indicate a service was furnished via synchronous, real‑time audiovisual telehealth (a live audio‑video conference between patient and provider) rather than in‑person. - Pair…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    2084P0800XPsychiatry PhysicianA Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, …
    208M00000XHospitalist PhysicianHospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient ca…
    207L00000XAnesthesiology PhysicianAn anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an opera…
    207R00000XInternal Medicine PhysicianA physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults…
    103G00000XClinical NeuropsychologistA clinical psychologist who applies principles of assessment and intervention based upon the scientific study of human behavior as it relates to norma…
    163WE0003XEmergency Registered NurseNursing Service Providers · Registered Nurse
    2084V0102XVascular Neurology PhysicianVascular Neurology is a subspecialty in the evaluation, prevention, treatment and recovery from vascular diseases of the nervous system. This subspeci…
    2470A2800XAssistant Health Information Record TechnicianNone

    Related Payer Policy Updates

    Specialty: Neurology/Neurosurgery1 / 2

    10 rows

    PolicyPayerEffective Date
    Lumbar Microdiscectomyuniverahealthcare2026-10-15
    Artificial Cervical Intervertebral Discuniverahealthcare2026-10-15
    Lumbar Decompressionuniverahealthcare2026-10-15
    Nerve Fiber Density Testing (IENFD/ENFD) Coverage CriteriaOscar Health2026-10-01
    Biomarker Testing for Multiple Sclerosis and Related Neurologic DiseasesOscar Health2026-10-01
    Biochemical Markers of Alzheimer Disease and DementiaOscar Health2026-10-01
    Serum Testing For Evidence of Mild Traumatic Brain InjuryOscar Health2026-10-01
    Evaluation of Cerebrospinal Fluid, Urine and Plasma for Alzheimer DiseaseBluecross Idaho2026-09-01
    Prior Authorization of Spinal ProceduresBlue Cross Blue Shield - Rhode Island2026-09-01
    Alzheimer's Disease - Amyloid Beta- Directed Antibodies - KisunlaCigna2026-08-15

    Related Codes

    CPT-90863-PHARMACOLOGIC-MANAGEMENT-AFTER-PSYCHOTHERAPY

    CPT 90863: Medication Management After Psychotherapy

    CPT-90865-NARCOTIC-INDUCED-HYPNOSIS-FOR-PSYCHIATRIC-DIAGNOSIS

    CPT 90865: Narcotic-Induced Hypnosis for Psychiatric Diagnosis and Treatment

    CPT-90867-TRANSCRANIAL-MAGNETIC-STIMULATION-INITIAL-TREATMENT

    CPT 90867: Transcranial Magnetic Stimulation, Initial Treatment

    CPT-90868-TRANSCRANIAL-MAGNETIC-STIMULATION-SESSION-MANAGEMENT

    CPT 90868: Transcranial Magnetic Stimulation, Subsequent Session

    CPT-90869-TMS-SUBSEQUENT-MOTOR-THRESHOLD-REDETERMINATION

    CPT 90869: TMS Subsequent Redetermination of Minimum Stimulation Intensity

    CPT-90870-ELECTROCONVULSIVE-THERAPY-PROCEDURAL-SEIZURE

    CPT 90870: Electroconvulsive Therapy (Seizure Induction)

    CPT-90875-PSYCHOPHYSIOLOGICAL-THERAPY-BIOFEEDBACK-PSYCHOTHERAPY-30MIN

    CPT 90875: Psychophysiological Therapy with Biofeedback, 30 Minutes

    CPT-90876-PSYCHOPHYSIOLOGICAL-THERAPY-BIOFEEDBACK-PSYCHOTHERAPY-45MIN

    CPT 90876: Psychophysiological Therapy with Biofeedback, 45 Minutes

    CPT-90880-HYPNOTHERAPY-PSYCHOTHERAPY

    CPT 90880: Hypnotherapy Psychotherapy

    CPT-90882-ENVIRONMENTAL-COORDINATION-PSYCHIATRIC-CARE

    CPT 90882: Environmental Coordination to Support Psychiatric Care

    Showing 1–10 of 13

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
    Published by

    Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

    Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

    Brief emotional/behavioral assessment (screening)
    Screening tools and brief assessments are often performed before or after unspecified procedures; these are billed separately when applicable.