ID · Services
What ID Actually Delivers — and Which of It Gets Paid For
Every service line an independent ID practice runs, including the contracted institutional work that creates real value and, in most practices, no revenue at all. Written as business lines: what drives each economically, and where each one leaks.
8 services4 categories
No rates here, by design. This library covers what drives the economics of each service and where it reliably fails on the revenue-cycle side. It publishes no payment amounts, RVUs or margins — those are practice-, payer- and year-specific. Use the Payer Center for authoritative rates and the calculators for your own numbers.
Outpatient clinic & consultation
Lower revenue per encounter than inpatient consultation in many settings, but far more schedulable — which matters enormously for practice stability, staff planning and cash predictability.
Typically delivered in:Office
What drives contribution
- Template design and the mix of new versus follow-up visits.
- No-show rate, which is high in a referral specialty with long lead times.
- Which visit types an APP can appropriately absorb within scope.
- Whether the clinic feeds the infusion and OPAT business or operates separately from it.
Where it goes wrong
- Level distribution that drifts downward over time without anyone auditing it.
- Referrals received but never scheduled, sitting in an unworked queue.
- Complex coordination performed between visits and never captured.
Inpatient consultation
The traditional core of ID practice. Volume-driven, dependent on hospital relationships and referral patterns, and paid on evaluation and management — which means documentation, not throughput, determines a large share of realised revenue.
Typically delivered in:Hospital
What drives contribution
- Referral relationships with named services and physicians, not a general hospital relationship.
- Level selection supported by documented medical decision-making or time.
- Travel and rounding efficiency across sites — an hour in a car is an hour not billed.
- Whether the consult generates downstream outpatient follow-up the practice retains.
Where it goes wrong
- Systematic under-levelling, driven by compliance caution rather than by the documentation.
- Time-based selection used without the time recorded in a form that supports it.
- Consults performed but never entered — reconcile the rounding list against the charge file.
Hospital follow-up & transitions
The long tail of an inpatient consult, and the point at which many ID practices lose the patient — and the OPAT episode — to another provider. Managing the transition deliberately is both a clinical and a commercial decision.
Typically delivered in:HospitalOffice
What drives contribution
- Continuity from inpatient consult through to outpatient follow-up.
- Whether the practice or the hospital owns the discharge antimicrobial plan.
- Documentation of the coordination work that transitions genuinely require.
- Speed of outpatient access after discharge, which decides whether the patient stays with you.
Where it goes wrong
- Follow-up visits within a period already covered by another service.
- Coordination time that qualifies but is never recorded.
- Patients discharged to an OPAT pathway managed by someone else, exporting the episode.
Antimicrobial stewardship & infection prevention
Services hospitals are required to maintain with named physician leadership — and which ID physicians routinely provide without a corresponding agreement. This is the most under-priced asset in most independent ID practices.
Typically delivered in:Hospital
What drives contribution
- Documented hours by category: committee time, protocol work, audit and feedback, formulary review, outbreak response.
- Whether directorship, stewardship leadership, coverage and clinical consultation are four separate agreements or one bundled fee.
- A defined scope with a review trigger, so obligations cannot expand while the fee does not.
- Institutional metrics you can evidence — antimicrobial expenditure, length of stay, survey outcomes.
Where it goes wrong
- An unquantified claim of value cannot be priced. Log the hours before opening the conversation.
- Physician-hospital arrangements sit within self-referral and anti-kickback frameworks, with fair market value and commercial reasonableness requirements. Involve healthcare counsel.
- Fixed fees attached to obligations that grow — the standard way ID economics erode over years.
Diagnostic stewardship & curbside consultation
The clearest example of ID's measurement problem: doing this well reduces measured activity elsewhere and generates little or no billable volume of its own. It belongs in a contracted arrangement or it will be invisible.
Typically delivered in:HospitalOffice
What drives contribution
- Volume of informal advice actually provided — log it before arguing about it.
- Whether the institution recognises the reduction in unnecessary testing it produces.
- Conversion of appropriate curbside contacts into formal consultation where clinically warranted.
- Inclusion in a directorship or stewardship agreement rather than treated as goodwill.
Where it goes wrong
- High-value advice given repeatedly with no record that it happened.
- Formal consultation avoided by the requesting service because informal advice is free.
- Reduced testing revenue attributed as a loss rather than as a stewardship outcome.
Infusion & drug administration
The ancillary business that makes independent ID economically viable in many practices — and the one that puts inventory, working capital and payment risk onto the balance sheet.
Typically delivered in:Infusion suiteOffice
What drives contribution
- Whether the practice acquires the drug (buy-and-bill) or administers product supplied by a specialty pharmacy.
- Nursing concurrency, which sets throughput before chair count does.
- Chair time per infusion including access, observation and turnover — not drip time.
- Pharmacist involvement for clinical review, compounding oversight and storage.
Where it goes wrong
- Infusion hierarchy errors on initial, subsequent and sequential services — high volume makes a systematic error a systematic loss.
- Documented start and stop times missing where required.
- Drug units and discarded amounts reported inconsistently with payer rules.
OPAT management & monitoring
Weeks of skilled clinical management generating comparatively few billable events. The defining commercial fact is that Medicare's coverage of home infusion antimicrobials differs materially from commercial coverage, which drives site of care more than clinical suitability does.
Typically delivered in:HomeInfusion suiteSkilled nursing facility
What drives contribution
- Site of care, determined by coverage at intake rather than after the plan is built.
- Coordination hours per course — authorisation, access, lab scheduling, weekly review, complication triage.
- Whether the coordinator role is funded, and by what.
- Institutional value created through avoided admissions, which accrues to the hospital unless contracted.
Where it goes wrong
- A therapy plan designed before coverage is understood, which frequently has to be rebuilt.
- Weekly review performed as an administrative note rather than a documented clinical decision.
- Monitoring results that return late or to the wrong clinician.
Specialised clinics — HIV, travel, bone & joint
Defined programmes with their own referral bases, payer behaviour and operational requirements. They can stabilise a schedule and diversify revenue, but each carries specific programme obligations that need checking before launch.
Typically delivered in:Office
What drives contribution
- A referral base you can evidence rather than assume.
- Programme-specific requirements, which differ substantially between clinic types.
- Whether medication access is managed in-practice or referred out.
- Session density — a clinic that runs half-full costs the same room and staff as a full one.
Where it goes wrong
- Programme eligibility, reporting and compliance requirements that differ by clinic type and by state.
- Coverage that varies widely, particularly for preventive and travel-related services.
- Care coordination and adherence work that is real, substantial and largely uncaptured.