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    v1.0.31
    OpenPayerBilling CodesTemporary National Codes (Non-Medicare)HCPCS hcpcs-s9434-modified-solid-food-supplements-inborn-errors-metabolism
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    HCPCS Level II S9434: Modified Solid Food Supplements for Inborn Errors of Metabolism

    HCPCS Level II code S9434 indicates provision of modified solid food supplements for inborn errors of metabolism, a specialized nutritional therapy service used to supply metabolically appropriate solid-form nutrition; service type: modified medical nutrition therapy / specialized nutritional supplementation; typical site of service: home, outpatient clinic, or specialty metabolic clinic where dietitians or metabolic specialists manage therapeutic diets for patients with inherited metabolic disorders.

    For related coverage guidance, see recent payer policy updates: Non-Emergency Facility to Facility Transfers, Non-Emergency Facility to Facility Transfers, Medical Necessity Guidelines Non-Emergency Transportation.

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    Clinical & Coding Specifications

    Clinical Context

    A patient with an inborn error of metabolism (for example, classic phenylketonuria or medium-chain acyl-CoA dehydrogenase deficiency) requires long-term dietary management with specialized modified solid food supplements. Typical patients are pediatric or young adult individuals managed by a metabolic geneticist and a registered dietitian. A realistic scenario: a 6-year-old child with phenylketonuria receives a clinic visit for routine metabolic follow-up. During the visit the metabolic geneticist assesses growth, neurodevelopment, and laboratory phenylalanine levels; the dietitian reviews dietary intake and prescribes a volume-based, modified solid food supplement formulated to be low in phenylalanine and enriched with appropriate amino acid substitutes and micronutrients. The clinic documents medical necessity, product formulation, quantity, delivery method, and duration. The supplement is dispensed via the clinic pharmacy or ordered through the patient’s durable medical equipment/supplement supplier. Billing uses HCPCS Level II code S9434 for the modified solid food supplement specific to inborn errors of metabolism. Typical contributors in the workflow include the metabolic geneticist (diagnosis and order), registered dietitian (formulation and monitoring), prescribing clinician (authorization and documentation), supplier/pharmacy (dispensing and claims submission), and payer adjudication (medical necessity review and coverage determination). Typical documentation includes the diagnosis, growth parameters, recent laboratory results, the specific product name and formulation, prescribed quantity and frequency, and notes on prior conservative dietary management and rationale for medical necessity.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    98960Education and training for patient self-management by a qualified, nonphysician healthcare professional, face-to-face; individual, 30 minutesUsed by registered dietitians or diabetes education specialists to provide training on use, storage, and monitoring of modified solid food supplements.
    99401Preventive medicine counseling and/or risk factor reduction intervention(s) provided to an individual; approximately 15 minutesCounseling about dietary adjustments and adherence to metabolic diet plans during clinic visits.
    99402Preventive medicine counseling and/or risk factor reduction intervention(s) provided to an individual; approximately 30 minutesExtended counseling sessions related to complex metabolic dietary regimens and supplement integration.
    96372Therapeutic, prophylactic, or diagnostic injection (specify substance or drug); subcutaneous or intramuscularIf parenteral nutritional or adjunctive therapies are provided alongside modified solid supplements in some metabolic conditions.
    G0511Rural health clinic or federally qualified health center (FQHC) visit - care managementUse when supply dispensing and counseling occur in a clinic setting requiring bundled billing for services tied to the supplement provision.

    Related Modifiers

    8 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…
    54Modifier ‑54 (“Surgical care only”) is appended to a CPT surgical procedure when the reporting surgeon performs the intraoperative (surgical) component but does not furnish the preoperative and/or…- Use modifier -54 when the reporting surgeon provided only the intraoperative (surgical) component of a procedure and preoperative and/or postoperative management has been or will be provided by…
    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…
    56Modifier ‑56 indicates the reporting provider furnished only the preoperative management for a surgical procedure and did not perform the intraoperative or postoperative care. It is used in…- Use Modifier -56 when a provider performs only the preoperative management in a split‑care situation (one physician manages preop care while a different physician performs the intraoperative…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207RG0100X
    2080P0208X
    193200000X
    3336C0003X
    101YP2500X
    126900000X
    2865M2000X
    364SP0811X

    Related Payer Policy Updates

    Specialty: Emergency & Medical Transportation1 / 3

    10 rows

    PolicyPayerEffective Date
    Non-Emergency Facility to Facility TransfersCareSource Georgia2026-11-01
    Non-Emergency Facility to Facility Transferscaresourcegeorgia2026-11-01
    Medical Necessity Guidelines Non-Emergency TransportationMass General Brigham Health Plan2026-11-01
    Non-Emergent Transportation Medical PolicyHealth-New-England2026-11-01
    Non-Emergency Facility to Facility Transfershap_caresource_mi_coordinated_health2026-11-01
    Ambulance and Medical Transport Services (Ground, Air and Water) Corporate Medical Policybcbsvermont2026-10-01
    Emergency Air/Water Ambulance Services Medical GuidelineWPS Health Insurance2026-10-01
    Non-Emergent Ambulance ServicesConnectiCare2026-09-11
    Fixed Wing Air Ambulance TransportCigna2026-08-15
    Air AmbulanceAmbetter Georgia2026-08-01

    Related Codes

    HCPCS-LEVEL-II-S2152-SOLID-ORGAN-TRANSPLANTATION-GLOBAL-CARE

    HCPCS Level II S2152: Solid Organ Procurement and Transplantation

    HCPCS-LEVEL-II-S2266-INDUCED-ABORTION-29-TO-31-WEEKS

    HCPCS Level II S2266: Induced Abortion, 29 to 31 Weeks

    HCPCS-LEVEL-II-S3630-EOSINOPHIL-COUNT-BLOOD-DIRECT

    HCPCS Level II S3630: Eosinophil Count, Blood, Direct

    HCPCS-LEVEL-II-S4017-INCOMPLETE-ART-CYCLE-CANCELLED-PRIOR-TO-STIMULATION

    HCPCS Level II S4017: Incomplete Cycle — Cancelled Prior to Stimulation

    HCPCS-LEVEL-II-S8055-ULTRASOUND-GUIDANCE-MULTIFETAL-REDUCTION-TC

    HCPCS Level II S8055: Ultrasound Guidance for Multifetal Pregnancy Reduction

    HCPCS-LEVEL-II-S8940-EQUESTRIAN-HIPPOTHERAPY-PER-SESSION

    HCPCS Level II S8940: Equestrian/Hippotherapy, Per Session

    HCPCS-LEVEL-II-S9024-PARANASAL-SINUS-ULTRASOUND

    HCPCS Level II S9024: Paranasal Sinus Ultrasound

    HCPCS-LEVEL-II-S9366-HOME-TPN-1-2L-PER-DAY-HOME-INFUSION

    HCPCS Level II S9366: Home Infusion TPN, 1–2 L/day

    HCPCS-LEVEL-II-S9446-GROUP-PATIENT-EDUCATION-NON-PHYSICIAN

    HCPCS S9446: Patient Education, Non-Physician Provider, Group, Per Session

    HCPCS-LEVEL-II-S9451-EXERCISE-CLASS-NON-PHYSICIAN-SESSION

    HCPCS S9451: Exercise Classes, Non-Physician Provider, Per Session

    Showing 1–10 of 532

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    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.
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