Why Physician Practices Have Cash Flow Problems Despite Strong Billing

Under 35 days in accounts receivable is generally strong for a mixed-payer physician practice; over 50 days signals a collection or denial-rate problem that’s degrading cash flow — and that gap is often why a practice billing $1.2M a year can still be scrambling to make payroll in October. And yet this is not unusual. The practice is busy. Patients are being seen. Claims are going out. But the bank account does not match the activity.

This is not a billing problem. It is a cash timing problem — and it has predictable causes.

Why Isn’t Billing the Same as Cash in a Physician Practice?

In medicine, there is a gap between when you earn revenue and when you receive it. That gap is called days in accounts receivable (AR) — the average number of days between when a claim is submitted and when payment arrives.

For a typical physician practice:

• Insurance payments: 15–45 days from claim submission
• Medicare/Medicaid: 14–30 days
• Commercial payers with clean claims: 20–35 days
• Commercial payers requiring coordination of benefits or authorization: 45–90 days
• Patient balances after insurance: 30–90+ days (depending on your collections process)

If your practice sees $100,000 in patients this week, roughly $35,000–$40,000 of that revenue may not be deposited until next month. This is structural — it is how the reimbursement system works. It is not a sign that anything is wrong. But if you are managing cash as if billing equals deposited cash, you will consistently be surprised.

What Are the Five Most Common Causes of Physician Practice Cash Flow Problems?

1. Owner Draws Timed to the Bank Balance, Not Earned Income

The most common source of physician practice cash crunches: taking distributions based on what is in the account rather than what the practice has actually earned after reserves.

If the practice billed $120,000 last month and $90,000 was collected, there is $30,000 sitting in open AR that will arrive this month. If you took a large distribution in anticipation of that $30,000 and then a large payroll hit before it was collected, the account is suddenly short.

The fix: calculate distributions based on actual collected cash minus operating reserves, not billing activity. This is a one-page calculation. Running it before every distribution prevents most cash crunches.

2. Overhead Creep That Is Not Reflected in Collections

Practice overhead tends to grow faster than collections when the practice is expanding. New staff hires, lease expansions, new equipment — these costs are immediate, while the revenue they generate takes months to show up in deposited cash.

A physician who adds a part-time NP in January and expects revenue to ramp by March may be correct about the revenue — but the payroll starts immediately, the revenue materializes 30–45 days after the NP starts seeing patients, and collections on those claims arrive another 30 days after that.

The cash timing gap during a ramp is real. Planning for it requires a cash flow projection — not just a P&L.

3. Seasonal Billing Patterns

Most physician practices have seasonal revenue patterns they do not consciously track. December tends to run lighter in many specialties as patients delay elective procedures. January can be strong in specialties affected by deductible resets. Summer drops in pediatrics are common as school-year illness loads decrease.

If the practice hits a lighter billing month and a large expense (malpractice renewal, lease payment, equipment purchase) hits the same period, the bank account can compress significantly — even though on an annualized basis the practice is profitable.

4. Unpaid Patient Balances Accumulating

High-deductible health plans have shifted more of the bill to patients. Practices that have not updated their patient collections process — front-end verification, point-of-service collections, statement cadence — tend to accumulate growing patient AR balances that never collect at full value.

A practice with $80,000 in patient AR that is 90+ days old is carrying a receivable that will likely collect at 30–50 cents on the dollar through a collections agency, and zero cents if written off. That expected-but-never-collected revenue shows up nowhere on the billing report — but the expense it was supposed to offset is already paid.

5. Tax Payments Taken From the Same Account

If the practice does not maintain a separate tax reserve account, estimated tax payments hit the operating account as a surprise every quarter. A $22,000 quarterly estimated payment in mid-September, on top of a normal payroll, can be the difference between a comfortable balance and an overdraft.

The solution is simple: hold your tax reserve in a separate account and treat it as unavailable for operations. Transfer the reserve percentage — typically 30–38% of K-1 income — when each distribution is taken. See the full quarterly estimated tax framework for how to calculate the right reserve percentage.

Is Your Cash Flow Problem a Timing Problem or a Structural Problem?

Cash flow problems have two different root causes that require different solutions:

Timing problem: The practice is profitable and collecting well, but collections are lumpy or lagged relative to fixed expenses. Solution: better cash flow forecasting, adjusted distribution timing, operating reserve management.

Structural problem: The practice has overhead that exceeds sustainable revenue, or AR is degrading (increasing days in AR, rising denial rates, growing patient balance write-offs). Solution: billing audit, overhead review, pricing analysis.

A monthly P&L tells you one but not the other. A cash flow statement tells you both — but only if it is prepared correctly, reconciled against the bank account, and reviewed by someone who understands how to read it.

What Metrics Should You Review Monthly to Track Cash Flow?

If you want to move from reactive cash management to proactive, three numbers should be reviewed monthly alongside the P&L:

Days in AR: Total open AR divided by average daily charges. Under 35 days is strong for a mixed payer practice. Over 50 days indicates a collection or denial rate problem that is degrading cash flow.

Collection rate by payer: Payments collected divided by charges, by insurance type. A collection rate below 85% on commercial payers, or below 95% on Medicare for clean claims, is worth investigating.

Operating reserve multiple: Current bank balance divided by monthly fixed expenses. Under 2.0 means you have less than two months of runway before a billing disruption would create a payroll problem. The goal is 2.0–3.0 as a floor.

These numbers do not require a complex accounting system. They require a monthly close that is done accurately and reviewed within a week of month-end — not three months later.

What Does Good Cash Management Look Like for a Physician Practice?

A well-managed physician practice at $800K–$1.5M in annual collections runs something like this:

1. Books close by the 5th of each month
2. P&L and cash flow statement reviewed by the 7th
3. Distribution capacity calculated using the working capital formula — not the bank balance
4. Tax reserve swept to a separate account before distribution
5. Quarterly estimated payment scheduled before the quarterly due date
6. Days in AR and collection rate reviewed against prior month

This is not a full-time CFO function. It is a disciplined monthly process that, once set up, takes about two hours per month to run. The cash flow crunch that comes from not doing it takes considerably longer to recover from.