O&P Line of Credit: Bridging Fabrication and Payment
An O&P line of credit is a revolving source of working capital that orthotics and prosthetics clinics can draw on to cover expenses while devices move from evaluation to delivery to payment. Because revenue is generally recognized when a device is delivered, not when it is cast or ordered, many O&P practices carry significant cash in work in progress at any given time.
This article explains why the gap exists, how a line of credit may help and what lenders typically review. It is general information only. Billing and payer rules vary by state and payer, and nothing here is legal, tax, billing or compliance advice.
Why O&P Cash Flow Has a Built-In Gap
A typical prosthetic or custom orthotic episode can involve several stages before a clinic is paid:
- Evaluation, physician documentation and order
- Prior authorization or payer review where required
- Casting or scanning, design and fabrication
- Test fittings, adjustments and final delivery
- Claim submission, processing and payment
Throughout that cycle, the clinic is paying practitioners, technicians, rent and materials. Prosthetic componentry often has to be purchased from suppliers before the clinic can deliver the device and bill for it. The result is a recurring need for cash that does not line up with when payments arrive.
What Ties Up Cash in an O&P Practice
Several items can absorb working capital:
- Work in progress: labor and materials invested in sockets, braces and other devices not yet delivered
- Componentry: knees, feet, hands and other parts purchased for specific patients
- Accounts receivable: delivered devices waiting for payment
- Denials and appeals: claims that take longer to resolve
- Seasonal and referral swings: months when deliveries cluster or slow down
Delays from prior authorization can lengthen this cycle. Our article on prosthetic prior authorization explains how authorization timing can affect cash flow.
How an O&P Line of Credit Works
A line of credit gives a business access to funds up to an approved limit. The practice draws what it needs, pays interest on the amount outstanding and can draw again as balances are repaid, depending on the terms.
For an O&P clinic, a line may be used to:
- Purchase componentry and materials for patients in progress
- Cover payroll while claims are being processed
- Smooth seasonal or month-to-month changes in deliveries
- Handle payment slowdowns from a particular payer
- Support a transition, such as a new location or ownership change
A line of credit is generally best suited to short-term, recurring needs. Long-term investments such as an acquisition, building or major lab equipment are usually better matched to term financing.
What Lenders Review for an O&P Line of Credit
Lenders typically look at the overall health of the practice and how reliably receivables turn into cash. They may review:
- Financial statements and tax returns
- Accounts receivable aging and collection history
- Payer mix and how concentrated revenue is
- Denial rates and documentation practices
- Existing debt and other obligations
- The owner’s credit and experience
Because payer mix influences how lenders view receivables, our article on O&P payer mix may help owners prepare. Approval, limits and terms depend on lender review, and nothing here is a commitment to lend.
Sizing a Line of Credit
A line that is too small may not cover the clinic’s real cycle, while a line that is too large may encourage borrowing for the wrong purposes. Owners may start by reviewing how much is typically tied up in work in progress, componentry and receivables over the course of a year, and how that changes in busy and slow periods.
An accountant can help model cash needs, and a lender will ultimately determine the available limit based on underwriting.
Using a Line Responsibly
- Draw for short-term operating needs, not long-term assets
- Pay down balances as claims are collected
- Track work in progress and receivables regularly
- Address documentation issues that slow payment, with help from qualified billing or compliance professionals
- Watch interest cost; our article on how interest rate decisions affect prosthetics practice financing explains why borrowing costs can change
Signs a Clinic May Benefit From a Line
Owners sometimes wait until cash is tight to explore credit, which can limit options. Signs that it may be time to consider an O&P line of credit include:
- Payroll timing depends on when a few large claims are paid
- The clinic delays componentry orders because of cash, not clinical timing
- Growth in referrals is creating more work in progress than cash on hand can carry
- One payer has slowed payments, putting pressure on the rest of the business
- The owner is using personal funds to cover routine operating costs
Arranging a line while the practice is financially healthy may give the owner more choices than waiting until a shortfall arrives.
Other Working Capital Options
Depending on the situation, a practice may also consider term working capital loans or including working capital within an acquisition or expansion loan. Our overview of working capital solutions describes the broader range of options, each subject to lender review.
Final Thoughts
An O&P line of credit can help a clinic bridge the time between fabrication and payment, cover componentry and keep payroll steady when claims take longer than expected. The right size and structure depend on the practice’s payer mix, collection history and growth plans.
US Medical Funding helps O&P practices find working capital and lines of credit suited to their cash flow cycle. Learn more about our prosthetics business working capital and lines of credit and our full range of prosthetics practice financing options.



