Practice type: Solo nurse practitioner practice Provider: 1 family nurse practitioner (FNP-C) Location: United States Patient volume: Approximately 380 patient encounters per month Payer mix: 44% Medicare, 33% commercial (BCBS, Aetna, UHC), 15% Medicare Advantage, 8% Medicaid Services: Primary care office visits, preventive care, Annual Wellness Visits, chronic disease management, telehealth, minor in-office procedures, tobacco cessation counseling
Background
Solo nurse practitioner practices occupy a specific place in the independent practice landscape. One provider. One set of credentials. A patient panel that often skews older and sicker than the average primary care practice because NPs frequently serve the patients that overloaded physician practices can’t absorb.
This FNP had been in solo practice for four years. She built her practice from scratch in an underserved area, accepted Medicare and Medicaid from day one, and had a growing patient panel that was primarily Medicare with a significant chronic disease burden exactly the patient population that generates the most complex billing requirements and, when billed correctly, the most revenue per encounter.
She was managing billing herself with help from a part-time medical assistant who handled scheduling and front desk duties. Claims went out through her EHR’s billing module. She had taken a basic medical billing course when she opened the practice. She understood the fundamentals. She had no idea what she didn’t know.
“I knew I was busy enough that I should be doing better financially,” she said when she contacted Malakos. “But I’m a solo practice. I don’t have a billing department. I don’t have anyone to ask whether what I’m doing is right.”
She was doing many things right. The gaps we found were specific but four of them were costing her the equivalent of a second full-time salary every year.
The Initial Audit – What We Found
Malakos conducted a full revenue cycle audit covering twelve months of claims data, a review of fifty patient encounter notes, six months of ERA and EOB records, and a complete AR aging analysis.
The practice was generating approximately $312,000 per year in collections. The audit identified that correctly billed, correctly captured, and correctly collected services should have been generating approximately $479,000 – a gap of $167,000 per year from six specific billing problems.
Finding 1 – Incident-To Billing Never Used – 15% Left on Every Qualifying Medicare Visit
This was the largest single revenue gap in the audit and the one the NP had never heard of.
Under Medicare’s incident-to billing rules, services rendered by an NP in a physician’s office setting can be billed under the supervising physician’s NPI at 100% of the physician fee schedule rather than under the NP’s own NPI at 85% when specific eligibility conditions are met:
- The service must be in the office setting
- A physician must have personally seen the patient and established the plan of care for the condition being treated
- The NP must be delivering a service within that established plan not treating a new problem
- The supervising physician must be physically present in the office suite during the visit
- The NP must be employed by or contracted with the practice
This NP practiced independently no supervising physician present, no physician group affiliation. Incident-to billing was not available to her in a traditional sense.
However, during the audit we identified that six months prior, she had entered into a collaborative practice agreement with a physician who joined her office on two days per week. On those two days approximately 40% of her monthly visits she was seeing established patients for follow-up of established conditions with the physician present in the suite.
Every one of those visits was being billed under her own NPI at 85%. Every one of them qualified for incident-to billing at 100%.
The 15% reimbursement difference on 40% of her visits applied across her Medicare and Medicare Advantage volume — represented approximately $28,400 per year in uncaptured revenue. Not from new patients. Not from new services. From the exact same clinical work, billed under the correct NPI.
She hadn’t known incident-to billing existed. The physician she had brought in for the collaborative agreement hadn’t mentioned it. Her EHR billed everything under her NPI by default.
Finding 2 – Chronic Care Management Never Billed
The NP’s Medicare patient panel was her core patient population. A review of active Medicare patients identified 142 patients with two or more documented chronic conditions meeting CCM eligibility criteria hypertension and diabetes, COPD and heart failure, depression and hypothyroidism.
Zero CCM claims had been submitted in the practice’s four-year history.
The care coordination work was happening. Phone calls between visits. Medication reconciliation. Referral coordination. The NP was doing it personally she knew her patients well and managed their care actively. None of it was being billed.
At Medicare’s reimbursement for CPT 99490 (first 20 minutes of clinical staff time per month), 142 qualifying patients represented approximately $5,964 per month in available CCM revenue $71,568 per year.
The NP’s reaction when we presented this finding was the most direct of the entire audit meeting:
“I have been doing this care for four years and Medicare would have paid me for it the entire time?”
Yes. Every month. For four years.
Finding 3 – E/M Visits Systematically Undercoded
The NP had been trained to use 99213 for established patient visits and 99214 only for what she described as “really complex visits.” In practice, 99213 appeared on 89% of her established patient claims.
Under 2021 AMA E/M guidelines, managing two or more chronic conditions simultaneously which describes the majority of her established Medicare patients supports 99214 moderate complexity MDM. A visit where she reviewed a patient’s HbA1c trend, adjusted metformin dosing, addressed a blood pressure that had been running high, and ordered a repeat renal function panel is not a 99213. It is a 99214.
The per-visit revenue difference under Medicare: approximately $40. Across 300 established patient visits per month with 60% qualifying for 99214 under correct documentation and coding: $7,200 per month in additional revenue $86,400 per year.
The NP’s response: “I was being conservative. I didn’t want to get audited.”
This is one of the most common misunderstandings in NP billing. Billing 99213 for a visit that supports 99214 isn’t conservative it’s incorrect in the other direction. The audit risk is in the mismatch between the code and the documentation, not in the code level itself. A correctly documented 99214 is more defensible on audit than an underdocumented 99213.
Finding 4 – Annual Wellness Visits Billed as Standard E/M Visits
Of the 94 Medicare patients who had received what the NP documented as annual wellness visits in the twelve-month audit period, 71 had been billed as 99213 rather than G0438 (initial AWV) or G0439 (subsequent AWV).
The billing error went in two directions:
For patients billed as 99213 rather than G0439, the practice collected the 99213 rate when the AWV rate was higher and more importantly when the AWV should have been covered as a first-dollar benefit for the patient. Some of those patients had received cost-sharing bills for visits that should have been entirely free under Medicare.
For visits where both a wellness assessment and a separately identifiable problem were addressed which was documented in 41 of the 94 AWV notes neither the G code nor a separate E/M with Modifier 25 had been billed correctly. The combination billing had been entirely missed.
Annual revenue gap from AWV coding errors: approximately $14,200.
Finding 5 – In-Office Procedures Not Captured at Billing
The NP performed several types of in-office procedures that her medical assistant routinely omitted from the charge ticket because the assistant’s training had been focused on office visit code entry:
- ECG with interpretation (93000): performed approximately 18 times per month, billed on 9
- Rapid strep test (87880): performed approximately 12 times per month, billed on 7
- Influenza rapid test (87804): performed approximately 15 times per month, billed on 8
- Cerumen removal (69210): performed approximately 6 times per month, billed on 2
- Tobacco cessation counseling (99406/99407): performed regularly, billed zero times
The charge capture gap on procedures charges for services delivered but never entered represented approximately $8,800 per year in missed billing. Tobacco cessation counseling alone, billed correctly for the patients where it was documented and clinically appropriate, would have added approximately $3,200 per year.
Finding 6 – Telehealth Claims With Wrong POS Code
The NP had maintained approximately 30% telehealth volume after the pandemic roughly 114 telehealth visits per month. Every telehealth claim was being submitted with POS 11 (office).
The correct POS code for telehealth visits where the patient is at home is POS 10. The POS 11 error created documentation-to-claim mismatches on 114 claims per month a compliance exposure that was accumulating across years of telehealth billing.
Additionally, commercial payer telehealth claims were being submitted without Modifier 95 required by most commercial payers for synchronous audio/video services.
The combined compliance risk from POS code errors and missing modifiers across 1,368 telehealth claims per year was the most pressing compliance finding in the audit.
Audit Summary
| Revenue Gap | Annual Estimated Impact |
|---|---|
| Incident-to billing never applied | $28,400 |
| CCM never billed (142 qualifying patients) | $71,568 |
| E/M undercoding (99213 vs. 99214) | $86,400 |
| AWV coding errors | $14,200 |
| In-office procedure capture gaps | $8,800 |
| Telehealth compliance (POS + modifier) | Compliance risk |
| Total identified annual revenue gap | $209,368 |
The gap between $209,368 identified and $167,000 recovered in year one reflects ramp-up time on CCM enrollment (consent collection and care plan development took 60 days to reach full eligible panel), gradual E/M documentation adjustment, and the incident-to workflow being implemented prospectively rather than retroactively.
The audit meeting lasted ninety minutes. The CCM finding produced the most extended silence.
“I’ve been seeing these patients for four years,” the NP said. “Managing their hypertension and diabetes and heart failure every month. Calling them between visits. Coordinating with their cardiologist. Medicare has been willing to pay me for that coordination the entire time, and I never knew to bill for it.”
She signed with Malakos the following week.
The Transition – First 30 Days
Onboarding took eight business days – one of the faster onboardings we conduct, because a solo practice has a simpler workflow than a multi-provider group. The practice used eClinicalWorks. Malakos continued working within eClinicalWorks.
Priority 1 – Telehealth compliance correction. From day one, POS 10 on all patient-home telehealth claims. Modifier 95 applied on all commercial payer telehealth claims. A retroactive POS code assessment was conducted on the prior six months of telehealth claims to determine the scope of the error and advise on corrective action.
Priority 2 – Incident-to workflow implementation. We built a date-based billing workflow that identified which appointment dates the supervising physician was physically present in the office. Established patient follow-up visits for established conditions on those dates were flagged for incident-to billing review and where eligibility was confirmed, billed under the physician’s NPI at 100% rather than the NP’s NPI at 85%.
Priority 3 – CCM infrastructure. We identified the 142 qualifying Medicare CCM patients, developed a consent script and consent documentation template, built a monthly time-tracking log into the care coordination workflow, and submitted the first CCM claims at the end of the first full billing month.
Month one CCM revenue: $3,820 (64 patients consented and billed in the first month the remaining 78 consented and enrolled in months two and three as the outreach process reached them).
Priority 4 – E/M documentation guidance. The NP received a one-page reference the 2021 AMA E/M guidelines applied specifically to the types of visits she conducts most frequently. The reference showed the specific documentation elements that distinguish 99213 from 99214 in a primary care context: managing two or more chronic conditions, reviewing diagnostic results, adjusting medications with monitoring risk, coordinating specialty care. The message: document what you’re already doing. The code level follows the documentation.
Priority 5 – Procedure capture checklist. We built a procedure-specific charge capture checklist into the medical assistant’s workflow a laminated reference showing the CPT codes for every in-office procedure the practice performed, with a checkbox prompt to confirm each service was entered at check-out.
90-Day Results
Incident-to billing: First month with incident-to implemented: 47 visits billed under physician NPI at 100% vs. 85%. Monthly reimbursement improvement from incident-to on those visits: approximately $2,350. Annualized: $28,200. Identical clinical work, correct NPI assignment.
CCM billing: Month one: 64 patients, $3,820. Month two: 118 patients, $5,900. Month three: 142 patients fully enrolled, $7,100. Monthly CCM revenue stabilized at $5,964 per month $71,568 annualized.
E/M code distribution:
| Code | Pre-Malakos | 90 days after |
|---|---|---|
| 99212 | 3% | 2% |
| 99213 | 89% | 41% |
| 99214 | 7% | 54% |
| 99215 | 1% | 3% |
Every code level change supported by documented clinical complexity in the corresponding note. No upcoding the documentation in the practice had always supported 99214 for the majority of complex chronic disease visits. The code level just hadn’t been reflecting it.
AWV billing corrected: G0439 applied to all subsequent Medicare AWV visits. Combination AWV plus Modifier 25 E/M billed on visits where a separate problem was documented. Patient cost-sharing complaints from AWV visits dropped to zero within 45 days.
Procedure capture: Procedure codes captured on 94% of qualifying encounters vs. the 50–60% capture rate pre-Malakos. Tobacco cessation counseling (99406/99407) billed for the first time $320 in the first month from a code the practice had never used.
Days in AR: Pre-Malakos: 58 days average. 90 days after: 37 days average.
12-Month Results
| Metric | Pre-Malakos | 12 Months With Malakos |
|---|---|---|
| Total net collections | $312,000 | $479,000 |
| Incident-to billing applied | Never | 100% of qualifying visits |
| CCM monthly revenue | $0 | $5,964 |
| E/M at 99214+ | 8% | 57% |
| AWV code accuracy | 24% | 97% |
| Procedure capture rate | ~55% | 94% |
| Telehealth POS compliance | 0% | 100% |
| Overall denial rate | 18.4% | 6.2% |
| Days in AR | 58 days | 35 days |
Total revenue improvement year-over-year: $167,000
What the Practice Said
At the one-year review the NP reflected on what had changed not just financially, but operationally:
“I opened this practice to serve patients who needed a provider. I knew billing was something I had to figure out, and I thought I had figured out enough of it to get by. The audit showed me what ‘enough’ was actually costing me.”
On the CCM finding:
“The math on CCM is straightforward once you understand it. 142 patients. $42 a month each. That’s $71,000 a year. I was doing the work. I just wasn’t getting paid for it. That’s not a billing problem that’s a knowledge problem. And now that I know, it changes how I think about every service I deliver.”
On the E/M correction:
“I was billing 99213 to avoid audits. My billing partner explained that the audit risk is in the mismatch between the code and the note — not in billing a high level when you’ve documented it correctly. That reframe changed everything. I document what I do. The code reflects what I document. That’s actually the safest way to bill.”
On the incident-to discovery:
“A physician joins my practice two days a week. I’m seeing established patients for established conditions. He’s in the office. And I’m still billing at 85% because nobody told me there was another option. That’s four years of not knowing something that was directly relevant to my revenue. The audit found it in two weeks.”
Key Takeaways
Incident-to billing is the highest-impact single billing function for NPs practicing in physician-affiliated settings. The 15% reimbursement differential between billing under the NP’s NPI and the physician’s NPI on qualifying visits represents material annual revenue for any NP with a significant Medicare panel. The eligibility conditions are specific and must be met on every qualifying claim but when they are met, the revenue difference is immediate and recurring.
CCM is the most consistently uncaptured revenue stream in NP primary care. NPs managing patients with multiple chronic conditions — which describes most primary care NP practices with Medicare panels have a CCM billing opportunity that in most practices has never been used. The care is already being delivered. The codes are well-established. The infrastructure just needs to be built.
E/M undercoding in solo NP practices reflects a misunderstanding about audit risk. The instinct to bill conservatively to avoid audits produces the opposite of audit protection a code level that doesn’t match the documented complexity is a mismatch regardless of direction. Correctly documented 99214 visits are audit-defensible. Underdocumented 99213 visits for complex chronic disease management are not necessarily safer.
Procedure charge capture in solo practices requires a workflow not trust. When one medical assistant handles scheduling, front desk, rooming, and charge entry simultaneously, procedure codes don’t get captured consistently without a structured prompt at every check-out. A laminated reference card and a checkout checklist cost nothing and recover thousands.
Is Your NP Practice Missing Similar Revenue?
If your practice hasn’t reviewed incident-to eligibility, CCM billing, or E/M coding accuracy in the past twelve months and particularly if you’re a solo NP or small NP group with a significant Medicare panel there is almost certainly a version of this case study sitting in your revenue cycle.
Malakos Healthcare Solutions offers a free nurse practitioner billing audit that identifies your specific revenue gaps in dollar terms before any commitment is made.
No commitment. No obligation. Just a clear picture of what your practice is collecting and what it should be.
Schedule Your Free NP Billing Audit
📞 +1 (307) 441-3431 ✉️ support@malakoshcs.com 📍 Cheyenne, Wyoming – Serving nurse practitioner practices nationwide
This case study represents a composite of common billing challenges and outcomes seen across nurse practitioner practices. Practice details have been generalized to protect confidentiality.
Related Reading
- Nurse Practitioner Billing Services
- Medical Coding Services
- Denial Management Services
- AR Follow-Up Services
Malakos Healthcare Solutions | Nurse Practitioner Billing Services USA | Serving solo NP practices and NP-led clinics nationwide since 2022
