Guide · Lab billing and revenue
B2B billing for labs: how to bill referring hospitals and corporates
A patient paying cash at the counter is the simple case. A hospital sending you twenty patients a month on an agreed rate, or a corporate wellness account that settles once a month against a statement, is a different workflow entirely. Here is how labs typically handle B2B billing for referring hospitals and corporates, and what to check before you extend credit to anyone.
Key takeaways
- B2B billing runs on credit, not counter cash. The patient walks out; the account gets billed later, usually monthly.
- Every B2B account needs its own rate card. A hospital or corporate rate is rarely the same as your walk-in price list.
- Reconciliation is where B2B billing actually breaks. A statement the other side disputes line by line costs more time than it saves in volume.
- Keep referral commission and B2B credit billing as two separate ledgers. One is what a doctor is owed; the other is what an account owes you. Mixing them makes both wrong.
- GST treatment on B2B accounts is general information here, not tax advice. Confirm your specific position with your accountant.
- When you shop for lab software, check whether it can run a credit account cleanly end to end, not just print a bill. See what to look for in lab billing software.
Most labs start with one billing model: a patient pays at the counter, walks away with a receipt, and the transaction is done. B2B billing shows up the moment a hospital starts referring patients under a standing arrangement, a corporate signs up its employees for an annual health check, or a TPA settles diagnostic claims on behalf of an insured patient. None of these buyers pay at the counter. All of them expect to be billed as an account, not as a walk-in.
How labs typically handle B2B billing to hospitals and corporates
The mechanics are broadly the same whether the account is a referring hospital, a corporate wellness client or a TPA, though the paperwork around each differs.
- Open a credit account
- Attach an agreed rate card
- Bill each visit to the account
- Send a monthly statement
- Reconcile and collect
A credit account is set up once, with the buyer's details and the terms agreed between the lab and that hospital, corporate or TPA. An agreed rate card sits on top of it, since B2B rates are almost never the walk-in price list: a hospital sending volume typically negotiates a lower per-test rate, and a corporate wellness package is usually priced as a bundle rather than test by test. Each patient visit under the account still produces its own bill, tagged to the account instead of collected in cash at the counter. At the end of the billing cycle, usually monthly, the lab totals every bill tagged to that account into a single statement and sends it to the buyer for payment. What comes back rarely matches the statement line for line on the first pass, which is where reconciliation work actually happens.
Rate cards: why the walk-in price list does not apply
Does every B2B account get its own price list, or does one catalogue serve everyone? A hospital referring a hundred patients a month, a corporate buying an annual check-up package for two hundred employees, and a TPA settling individual claims each negotiate their own terms. Running all three off a single walk-in price list either undercharges the ones who agreed to less volume-based pricing or overcharges the ones who negotiated a bundle rate. A separate rate card per account, applied automatically at billing time, is what keeps this from turning into a manual price lookup on every single bill.
| Account type | Typical rate basis | Typical billing cycle |
|---|---|---|
| Referring hospital | Negotiated per-test rate, often below walk-in price | Monthly statement |
| Corporate wellness account | Bundled package rate per employee or per check-up | Per campaign or monthly, by agreement |
| Insurance TPA | Rate per approved claim, set by the payer | Per claim batch, timelines set by the TPA |
Reconciliation: where B2B billing actually breaks
Can you produce, on request, exactly which visits make up a disputed line on a statement? A hospital's accounts team will not simply pay a total. They will want the list of patients, dates and tests behind that number, and they will query anything that does not match their own referral log. A lab that cannot pull that detail quickly ends up re-building the statement by hand every month, which is the single most common reason B2B accounts turn into a slow-paying headache instead of steady revenue.
A statement the other side has to dispute costs more time than the volume was worth.
The same discipline applies to reducing revenue leakage on B2B accounts specifically: a bill that never gets tagged to the right account, or a discount applied at the counter with no record of who approved it, is money that quietly does not make it into next month's statement at all.
Keep B2B credit billing separate from referral commission
Is the hospital's credit account the same ledger as the referring doctor's commission, or are they kept apart? These are two different obligations running in opposite directions. A B2B credit account is money the hospital or corporate owes the lab for tests performed. A referral commission is money the lab owes a doctor, consultant or collection centre for sending the patient in the first place. A single hospital account can involve both at once: the hospital owes the lab for the panel, and a doctor inside that hospital is separately owed a referral commission on the same visit. Mixing the two into one running number makes both wrong. See our guide on how doctor referral payouts are worked out if commission payouts are the piece you are trying to fix.
General information, not tax advice
GST treatment on B2B diagnostic billing varies with the nature of the service, the buyer, and the specific arrangement, and healthcare and diagnostic GST treatment in India has real nuance. What is above is general information on how labs typically approach it in 2026, not a definitive tax position. Rules change and interpretations differ; confirm your specific GST treatment with your accountant before you finalise how any B2B account is invoiced. See our broader GST for diagnostic labs guide for the same caveat applied more widely.
What to look for in lab billing software for B2B accounts
Can the software tag a bill to a credit account instead of collecting cash, without turning it into a manual workaround? A billing screen that only knows "paid" or "not paid" forces staff to fake a payment just to move the patient through, which then makes your own cash reports wrong. Look for a proper credit or account-billing path, not a workaround dressed up as one.
Does every bill still get a sequential number and a clean audit trail, even when it is billed to an account instead of collected at the counter? HealthFlow's lab billing software gives every bill sequential fiscal-year numbering and stores every rupee as integer paise, so nothing rounds away between the bill and the statement. Any discount applied at billing is recorded with the staff name attached, so a rate-card exception on a hospital account is traceable to who approved it, not a mystery line on next month's total.
Can you see what an account owes at a glance, split by how old the balance is? Receivables aging, in HealthFlow shown on the owner side, tells you whether a hospital's outstanding balance is fresh or has been sitting for two billing cycles, which is the first sign an account needs a phone call before it needs a statement. Partial billing (settling part of a large panel now, the rest later) and WhatsApp bill sharing, on Modern Lab, from the lab's own number, round out the day-to-day mechanics once an account is live.
None of this amounts to a dedicated "B2B module." It is the same billing engine a walk-in patient's bill runs through, applied with an account-level rate card and a statement view on top. When you are comparing lab software specifically for hospital or corporate accounts, ask each vendor to show you that path live, on a real account, not a slide.
Frequently asked questions
What is B2B billing for labs?
B2B billing is how a lab bills organisations rather than individual walk-in patients: referring hospitals, corporate wellness accounts, insurance TPAs and collection centres that send patients on an agreed rate card and settle the bill later, on credit, instead of the patient paying at the counter. It runs alongside normal cash and card billing, not instead of it.
How do labs bill referring hospitals and corporates?
Most labs open a credit account for the hospital or corporate, attach an agreed rate card (often different from the walk-in price list), and let patients referred under that account walk out without paying at the counter. Each visit still generates its own bill, but the bills are tagged to the account instead of collected in cash. Periodically, usually monthly, the lab totals the account, sends a statement, and collects payment against it rather than against each visit individually.
Do labs charge GST on B2B diagnostic billing?
This varies by the nature of the service and the buyer, and the position can differ for a hospital account versus a corporate wellness account versus a TPA. This is general information, not tax advice: confirm your specific GST treatment with your accountant or auditor before you finalise how B2B accounts are invoiced.
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