PT Superbills for Cash-Pay Patients: Fields, Medicare, GFEs

· compliance · Therapy · Rehabilitation Health

A superbill is the itemized receipt a cash-pay or out-of-network physical therapy patient submits, with their insurer’s own member claim form, to seek reimbursement. A missing field can get the claim kicked back, so a superbill carries the same core data elements as a CMS-1500 claim, NPI, tax ID, place of service, ICD-10, CPT with modifiers, units, and charges, even though the practice never files one.

Two groups need a different answer than “just hand them a superbill.” A Medicare beneficiary generally cannot use one for a covered service: claim submission is mandatory, not optional, for any enrolled provider. And under the No Surprises Act, an uninsured or self-pay patient is owed a written good faith estimate (GFE) before treatment, with a $400 threshold for disputing a bill that comes in higher, a 120-day window to dispute it, and a $25 fee to start that process. Medicare beneficiaries are not entitled to a GFE at all.

This guide covers what belongs on a superbill, who can and cannot substitute one for a claim, and what a compliant GFE has to contain for a recurring plan of care. Current as of September 2026.

What is a physical therapy superbill, and who accepts it?

A superbill has no legal form of its own. It is an itemized statement of what was done, at what charge, that the patient files with their own insurer. Aetna’s member claim form doubles as a field checklist: patient name, condition treated, type and dates of service, plus a provider section covering diagnosis, procedure codes, place of service, charges, units, referring physician, billing name, address, phone, tax ID, and total charge versus amount paid (Aetna medical claim form, June 2025).

That form also has an assignment of benefits block, letting the patient route payment straight to the provider. A superbill skips that step: the practice collects its full cash rate at time of service and has no further role, and the payer reimburses the patient against the out-of-network benefit, on the member’s own filing deadline, which varies by plan.

What has to be on a physical therapy superbill

Most payer claim forms mirror the CMS-1500, so the list below comes from its item-by-item instructions (Medicare Claims Processing Manual, Ch. 26, §10.4).

Field Why it is there Where the requirement comes from
Rendering provider NPI (individual) Identifies the treating clinician CMS-1500 Item 24J
Billing NPI (group) Identifies the paid entity CMS-1500 Item 33a, required
Tax ID (EIN or SSN) Ties the charge to the practice for reporting Item 25
Practice billing name, address, phone Confirms billing location Item 33, required
Patient demographics (name, DOB, relationship) Matches the bill to the member’s policy Aetna claim instructions
Date of service Anchors each line to a specific visit Item 24A, required
Place of service (11, Office) Flags the outpatient office setting, not home or telehealth Item 24B; CMS Place of Service Code Set (updated 02/17/2026)
ICD-10 diagnosis codes, priority order Ties services to medical necessity, primary first Item 21
CPT/HCPCS codes with GP modifier Marks the service as PT-plan-of-care therapy Item 24D; Ch. 5, §20.1
Units, with total timed minutes Supports the unit count; see the 8-minute rule Item 24G
Charge per line Prices each service line Item 24F
Total charge and amount paid Shows what to reimburse against Items 28 and 29
Referring provider name and NPI Documents the referral behind the plan of care Item 17 and 17b
Provider signature (“Signature on File” accepted) Attests to accuracy Item 31, required

GP is a Medicare rule; whether a given commercial plan edits for it is a plan-by-plan question. Including it on every therapy line costs nothing and removes one reason for a returned claim.

Can a Medicare patient get a superbill instead of a claim?

Usually not, for a covered service. Federal law requires an enrolled provider to submit a claim for any covered Part B service within one year and bars charging the beneficiary for the paperwork (SSA §1848(g)(4)(A)). Enrollment is a prerequisite to collecting from a beneficiary at all (42 CFR 424.505), and a side agreement to skip Medicare has “no legal force and effect” for covered services, an exception that “does not apply to noncovered charges” (Benefit Policy Manual, Ch. 15, §40). The CMS-1490S beneficiary self-filing form is only for when the provider refuses to bill; it doesn’t excuse that failure (Claims Processing Manual, Ch. 26, §20).

Service type Claim required? Superbill OK instead?
Covered, medically necessary Yes, within 1 year No
Covered, but expected denial Yes, if beneficiary wants Medicare’s determination (ABN, GA modifier) No
Statutorily noncovered No Yes

For the GA, GX, GY, and GZ modifier mechanics, see Medicare Cash-Pay Physical Therapy and ABN Modifiers in Therapy.

When does a cash-pay PT clinic owe a good faith estimate?

Separately from Medicare rules, the No Surprises Act requires every licensed provider to give uninsured and self-pay patients a written GFE, effective for services scheduled on or after January 1, 2022, with no specialty exempt (45 CFR 149.610; 86 FR 55980; FAQ Part 1).

Who counts as self-pay. The regulation covers anyone with no applicable coverage, plus anyone who has coverage but doesn’t want a claim submitted (45 CFR 149.610(a)(2)(xiii)), exactly the cash-pay-with-a-superbill patient. Health care sharing ministry members count as uninsured too, unless also enrolled elsewhere (FAQ Part 5). Medicare is the exception: federal health care programs are excluded, and a beneficiary is “not entitled to a GFE, even if the program does not cover the item or service” (CMS fact sheet, December 2024).

Intake duty. Ask at scheduling whether the patient has coverage and wants a claim filed, and post and orally communicate that GFEs are available. Any inquiry about cost counts as a GFE request (45 CFR 149.610(b)(1)), so a front-desk price question triggers the obligation regardless of the words used.

Timing.

Scheduling window Deadline to provide the GFE
3 to 9 business days before the service 1 business day after scheduling
10 or more business days before the service 3 business days after scheduling
Patient requests a GFE before scheduling 3 business days after the request

A visit scheduled fewer than 3 business days out, including a walk-in, does not require a GFE; one given anyway is voluntary and not eligible for the dispute process below, “regardless of whether the individual’s final bill exceeds the voluntary GFE by $400 or more” (FAQ Part 5). “Business days” excludes federal holidays; the estimate is due by 11:59 p.m. on the day it’s owed.

Content. At minimum, 45 CFR 149.610(c)(1) requires:

A diagnosis code is required “only where one is required for the calculation of the GFE” (FAQ Part 2), and “expected charge” means the cash rate net of any self-pay discount; a GFE is owed even to a patient with no expected financial responsibility. CMS’s model GFE form isn’t mandatory but counts as good faith compliance.

Recurring plans of care. A clinic does not need a new GFE for every visit. CMS names physical therapy directly: a provider “may issue a single GFE” for “recurring items and services, such as … physical therapy services” (FAQ Part 2). It must state expected frequency, timeframe, and total visits, and cannot cover more than 12 months; a longer plan needs a new GFE (45 CFR 149.610(b)(1)(x)). The GFE is part of the medical record, reproducible on request for up to 6 years, in written form, savable and printable if electronic.

The $400 dispute process. If total billed charges land at least $400 more than the GFE’s expected charges for that provider, the patient can initiate patient-provider dispute resolution (PPDR) by postmarking notice within 120 calendar days of the first bill (45 CFR 149.620). The fee to start a case is $25, per CY 2023 guidance, still the most recent CMS lists as of September 2026 (PPDR administrative fee). While pending, the practice cannot move the bill into collections, must pause any already underway, and must suspend late fees (CMS provider guidance).

What’s still open. In December 2022 HHS extended, “pending future rulemaking,” its enforcement discretion for GFEs that omit co-provider and co-facility charges, a detail that mostly matters when a clinic refers out for imaging (FAQ Part 3); as of September 2026, no superseding rule appears on CMS’s No Surprises Act policies page. Separately, the GFE requirement for insured patients, and the related advanced explanation of benefits, still has no rule; HHS defers enforcement until one is adopted (FAQ Part 1), and its most recent progress report is the December 2024 AEOB update. That doesn’t help an insured patient who wants a superbill instead of filing, though: not filing makes them self-pay, so the GFE obligation applies now.

What goes in a GFE for a 12-visit plan of care

An outline, not a template to copy verbatim; confirm content against 45 CFR 149.610(c)(1) directly.

Section What goes in it
Header Provider name, individual and group NPI, tax ID, office address and state, date issued
Patient Name, date of birth, preferred contact method
Primary service Plain-language description and scheduled date of the first visit
Diagnosis code(s) Only if needed to calculate the estimate
Itemized charges Evaluation code and rate x 1; CPT code(s), quantity, and rate per visit; scope, e.g. “up to 12 visits, 2 per week for 6 weeks, [dates]”; total expected charges (use $X, never an invented rate)
Validity period The required 12-month line, e.g. “valid for 12 months from the date of this Good Faith Estimate”
Separately scheduled items Imaging, DME, or similar, with the disclaimer directly above
Disclaimers Other items may exist; this is only an estimate; right to dispute; not a contract
Delivery and filing Paper or electronic (savable, printable); copy filed to the medical record

Superbill vs courtesy billing vs assignment of benefits vs in-network

Model Who files the claim Who gets paid directly What the patient owes up front
Superbill Patient, with the practice’s itemized statement Patient, per out-of-network benefit Full cash rate at time of service
Courtesy billing Practice, without accepting assignment Patient, unless they sign assignment of benefits Full charge, typically due at time of service
Assignment of benefits Practice or patient Practice, once the payer honors the assignment Whatever the plan does not cover
In-network Practice, per the payer contract Practice, at the contracted rate Contracted cost-share only

Under Medicare, assignment lets the beneficiary have Medicare pay the provider directly, in exchange for the provider accepting Medicare’s allowed amount as payment in full (Claims Processing Manual, Ch. 1, §30.3.2). A non-participating provider can file unassigned instead, paying the beneficiary directly, the closest Medicare gets to courtesy billing; see Medicare Cash-Pay Physical Therapy for the limiting-charge math. Filing the claim itself is not optional, either way, for a covered service.

State rules and record retention

The federal GFE rule is a floor, not a ceiling. States acting as primary enforcer can apply stricter definitions, such as excluding state as well as federal holidays from “business days,” but a state GFE process still has to meet every federal content requirement.

Record retention has two clocks: the GFE, reproducible on request for 6 years as part of the medical record, and HIPAA’s own requirement that covered entities keep required documentation “for six years from the date of its creation or the date when it last was in effect, whichever is later” (45 CFR 164.530(j)(2)). General medical record retention is set by state law and varies; check your state’s requirement rather than assume a number. For prepaid visit packages sold alongside cash-pay superbills, see Cash-Pay PT Packages and State Board Rules.

This article is general information, not legal advice; confirm state requirements with counsel or your licensing board.

Quick answers

Can a patient with commercial insurance ask for a superbill instead of filing with their plan?

Yes; that choice makes them “self-pay,” and the practice owes them a GFE just as it would an uninsured patient.

Is a health care sharing ministry member insured or uninsured for GFE purposes?

Uninsured, so a GFE is owed, unless the member is also enrolled in a group health plan, individual coverage, or a federal health care program.

Does a walk-in appointment need a GFE?

No, not when a service is scheduled fewer than 3 business days ahead. One given anyway is voluntary and not eligible for the dispute process.

What happens if a plan of care runs past 12 months?

The recurring-services GFE can’t exceed 12 months. A plan of care running longer needs a new GFE before the additional visits are furnished.

The visit ran long and I billed an extra unit that wasn’t in the GFE. Is that a problem?

Billing something unforeseeable is allowed, but a total $400 or more over the GFE lets the patient dispute it, and the practice must show the charge was necessary and unanticipated.

Getting superbill fields and unit counts right starts with documentation that doesn’t let shortcuts slip through. PrismEHR is built for the efficiency of cash-based practices with the power to handle insurance when needed, whether a practice is cash-only, insurance-only, or hybrid, and it lets organizations define their own billing rules, including minute and unit restrictions, enforced at documentation and reinforced again at claim creation. Units also default to zero rather than pre-filling from the prior visit. For physical therapy practices running prepaid packages alongside cash-pay superbills, see Cash-Pay PT Packages and State Board Rules.