Billing and Coding for Inpatient Notes
Every page on this site tells you that documenting properly lets you bill better and make a case for a higher level of care. This is the page that explains how.
Nobody teaches this. You finish residency not knowing what makes the note you spent forty minutes on a level two instead of a level five. The difference is usually work you already did and never wrote down.
What changed Read this first
The level of service used to be driven by counting: HPI elements, systems in the review, exam bullets. Whole careers were built on templates that generated a fourteen system review on a patient you saw from the doorway.
That is over. With the 2021 office visit changes and the 2023 changes that reached hospital and inpatient services, the level is set by medical decision making, or alternatively by total time on the calendar date. You pick one or the other. The history and exam still have to be performed, documented and medically appropriate. They no longer drive the level.
The section that determines your payment is the assessment and plan. It always should have been. You are paid for thinking, and the note is the only evidence that thinking occurred.
Medical decision making Two of three
Medical decision making has three elements:
- The number and complexity of problems addressed
- The amount and complexity of data reviewed and analyzed
- The risk of complications, morbidity or mortality from management
Each is scored into a category, roughly straightforward, low, moderate or high, and your overall level is set by the category you meet or exceed in two of the three. The lowest is ignored.
That rule is the most useful thing here. Three active problems treated with drugs that require monitoring gets you there on problems and risk, with no data element at all. Ask which two elements you are relying on, then check that the note actually shows both.
Problems addressed Not the problem list
A problem is "addressed" when you evaluated it and documented an assessment and a plan for it. That is the whole test. A problem on the past medical history list that you did nothing about is not addressed. "History of atrial fibrillation" in the PMH, never mentioned again, is not addressing atrial fibrillation, and neither is an EHR problem list you never touched.
What raises this element is not the number of diagnoses, it is severity and instability. One acute illness threatening life or bodily function outranks four stable chronic conditions.
Not addressed
PMH: type 2 diabetes, hypertension, COPD, CKD stage 3. Assessment: "1. Cellulitis. IV vancomycin."
Addressed
- Left lower extremity cellulitis, failing oral therapy. IV vancomycin, renally dosed, trough with the third dose. Margins marked, cultures pending.
- Type 2 diabetes, uncontrolled, A1c 11.2, contributing to the infection. Hold metformin, basal insulin 0.3 units/kg with correction scale.
- CKD stage 3, stable, creatinine 1.6 at baseline. No NSAIDs, no contrast, daily BMP.
Same patient, same medicine. The second version documents three addressed problems, two of them driving management. That is not padding, it is what you were already doing in your head. Same argument at length in the assessment and plan section of the H&P guide.
Listing "history of C-section" and "history of tonsillectomy" as addressed problems is padding, and an auditor sees it in ten seconds. If you did not evaluate it and have no plan for it, leave it in the past medical history.
Data reviewed and analyzed Say that you did it
This is the most under-documented element, because the work is invisible unless you write it down.
The outside discharge summary, the old catheterization report, the nursing home medication list. Name the source and what you found: "Reviewed the St. Mary's discharge summary dated 7/12: ejection fraction 25 percent, discharged on carvedilol 12.5 mg twice daily."
Unique tests ordered or reviewed. Ordering a test and later reviewing that result generally counts once, and a panel counts as one test, not fourteen.
You interpreting a study somebody else bills the formal read for. It counts only if you write your own interpretation in your own words: "Chest x-ray reviewed by me: bibasilar opacities and small effusions, no pneumothorax." "CXR: see radiology" is not an interpretation.
A real exchange about management with a physician outside your group or specialty. A consult order is not this. Document who, when, and what was decided: "Discussed with Dr. Okafor, the outpatient nephrologist, at 1615. Advises holding the ACE inhibitor and rechecking in 48 hours."
Credit comes from documenting the act, not from performing it. If it is not in the note, it did not happen.
Risk The most underused element
Risk means the risk of complications, morbidity or mortality from the management you chose, including options you considered and rejected. It is not the same as severity of disease. What pushes an inpatient encounter into high risk:
- Drug therapy requiring intensive monitoring for toxicity. Toxicity, not efficacy, and generally a defined assay on a short interval. Vancomycin with troughs and renal function. Heparin with serial anti-Xa. Amiodarone loading with QT monitoring. An A1c in three months is efficacy and does not count.
- A decision about hospitalization or escalation of care, including the decision to admit rather than discharge and the decision not to escalate. Document the reasoning either way. The same goes for decisions about major surgery or an emergency procedure.
- A decision about DNR status or de-escalating care for poor prognosis. A real goals of care conversation is high risk decision making by any honest reading. Record who was present, what was offered, what was decided. The medicolegal reasons are in the charting guide.
- Parenteral controlled substances. IV hydromorphone, a fentanyl infusion, IV lorazepam for withdrawal.
Document what you rejected, because rejected options count. "Considered thrombolysis, deferred given the GI bleed on 7/28 and the absence of hemodynamic compromise" is documented high risk decision making, and it is the sentence that defends you later.
Time-based billing Write the number
Instead of medical decision making, you can select the level by the total time you personally spent on that patient on the calendar date of the encounter. This is useful for the patient who is not complicated but eats your morning: the family meeting, the placement problem, the long goals of care conversation.
What counts, face to face or not: preparing to see the patient and reviewing records, obtaining the history and examining, counseling the patient or family, ordering medications and tests, independently interpreting and communicating results, coordinating care, and documenting the encounter.
What does not count:
- Time on a separately billable procedure. You cannot count the lumbar puncture time and also bill the lumbar puncture.
- Time on any other calendar date. The hour at 11 p.m. and the hour at 1 a.m. are two different dates.
- Travel time, and time waiting for a study.
- Teaching not directed at this patient. Resident time and the split or shared visit rules are their own subject; ask your coder.
"Spent considerable time with the family" is worth nothing. "Total time on the date of service devoted to this patient, including chart review, examination, coordination of care and documentation: 65 minutes" is worth exactly what it says. No number, no time-based billing.
Critical care time Thirty minutes
Critical care is a separate, time-based service with two independent requirements, and residents routinely get the time right and the clinical justification wrong.
Clinically, it requires a critical illness or injury acutely impairing one or more vital organ systems, with a high probability of imminent or life threatening deterioration, and care directed at preventing that deterioration. A patient can be in the ICU and not be critically ill, and can be critically ill on a medical floor at three in the morning. The physiology decides this, not the unit.
By time, it generally requires at least 30 minutes of your personal time on that date; below that you bill a regular visit. The time need not be continuous, but it must be spent immediately available to the patient, devoted solely to that patient, and it excludes separately billable procedures. Which procedures are bundled is a real list, it is not intuitive, and it changes. Get it from your coder.
A defensible critical care attestation
"Critical care time: 55 minutes. This patient has septic shock with acute hypoxemic respiratory failure and acute kidney injury, representing acute impairment of multiple vital organ systems with a high probability of imminent, life threatening deterioration. Critical care was required to assess and support failing organ systems and prevent further deterioration, including serial bedside reassessment, independent interpretation of serial blood gases and lactates, titration of norepinephrine to a mean arterial pressure goal of 65, ventilator adjustment, and discussion of goals of care with the healthcare proxy. The 55 minutes represents time I personally spent devoted solely to this patient, exclusive of the separately billable central venous catheter placement and of time billed by any other provider."
Every clause is doing work: organ systems named, deterioration stated, time accounted for, procedure carved out. Keep your own version in a smart phrase, then edit the clinical detail every single time, so that it describes the patient in front of you.
Observation versus inpatient Expected length of stay
Status is not a measure of how sick the patient looks. It is a prediction you make about how long they will need hospital care, and the prediction is what gets audited.
Under the Medicare two-midnight expectation, if you reasonably expect the patient to require medically necessary hospital care spanning at least two midnights, inpatient status is generally appropriate. If you expect them gone before that, observation generally is. Commercial payers apply their own criteria and frequently disagree with you.
The part people miss: the standard is your reasonable expectation at admission, as supported by the documentation, not what actually happened. A patient who improves and leaves the next morning does not retroactively make the admission wrong, provided the record shows why you expected two midnights. A record silent on your expectation gives the auditor nothing to agree with.
One sentence in the plan on the day of admission: "Given the failure of outpatient oral therapy, the need for intravenous antibiotics with level monitoring, and the pending MRI to evaluate for osteomyelitis, I expect this patient will require hospital care spanning at least two midnights. Admit to inpatient status."
The biggest documentation failure Say why they are here
A resident writes a genuinely excellent assessment and plan. The medicine is right, the reasoning is clear, the plan is thorough. And nowhere does the note say why this human being needs to be inside a hospital rather than at home with a prescription. It answers what is wrong and what we are doing, and never answers what the payer, the auditor and the utilization review nurse are all asking: why here?
Before
"1. Left lower extremity cellulitis. IV vancomycin. Elevate the leg. Wound care consult. Follow the exam."
After
"1. Left lower extremity cellulitis, failing outpatient therapy and requiring inpatient management. He completed five days of oral cephalexin with progression of the erythema by 6 cm and a new fever to 38.9 C. A1c is 11.2 with a nonhealing ulcer at the site, raising concern for underlying osteomyelitis. He requires IV vancomycin with trough and renal function monitoring, MRI of the foot, and serial exams with the margins marked. Outpatient management is not appropriate given the need for parenteral antibiotics with drug level monitoring. I expect at least two midnights of hospital care."
The medicine did not change. The second version documents an addressed problem with progression, a high risk decision, the failure of the alternative, and the expected length of stay, and it took thirty seconds longer to write.
What typically raises the level of service
| Element | Typically lower | Typically higher |
|---|---|---|
| Problems addressed | One stable chronic problem | Acute illness threatening life or bodily function, or severe exacerbation |
| Problem documentation | Diagnoses listed with no plan | Every active problem carries its own assessment and plan |
| Data | A panel ordered, result glanced at | Outside records summarized, your own read of a study written out, a documented discussion with an external physician |
| Risk | Routine therapy, no monitoring | Drug therapy monitored for toxicity, escalation decisions, DNR or de-escalation, parenteral controlled substances |
| Alternatives | Not mentioned | Options considered and rejected, with the reasoning |
| Status | Nothing about why hospital care is needed | Why outpatient care failed or is unsafe, plus expected length of stay |
| Time | "Extensive time spent counseling" | A number of minutes and what it was spent doing |
| Critical care | "In the ICU, critical care provided" | Organ systems named, deterioration stated, minutes stated, procedures carved out |
How not to get in trouble
All of this is about getting credit for work you actually did. The moment it becomes about generating documentation to reach a level, you have crossed from coding into fraud.
- Never document something you did not do. Not an exam finding, not a review of systems, not a record review, not a phone call, not a minute of time. Everything else is a special case of this rule.
- Cloned notes are indefensible. Auditors run text-similarity analysis, and a run of identical daily notes on a changing patient proves the documentation does not describe the patient.
- Upcoding through copy-forward is fraud, not optimization. Carrying yesterday's problem list forward so today's note shows four addressed problems when you addressed one is a false claim, and it does not become acceptable because the EHR made it easy.
- Attest only to what you personally did. This is where documentation risk and billing risk become the same risk, and it is the one that ends careers rather than merely costing money.
The long version is in charting to survive a lawsuit. The short version: the note that bills correctly and the note that defends you are the same note, because both are an accurate record of what you did and why.
When you finish an assessment and plan, ask two questions. Does every active problem have a plan attached to it? Does the note say, in words, why this patient needs to be in a hospital? If both answers are yes, the level of service takes care of itself.
Related: the assessment and plan, where the level of service is actually earned, and charting to survive a lawsuit.
This is not coding advice. Coding rules change, they differ between Medicare and commercial payers, and your institution may layer its own policy on top. This is general structure, not a rulebook. Confirm anything here with your own coding and compliance department before you rely on it. They are the ones standing next to you in an audit, and they are happy to be asked.