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Infectious Disease Billing Services
Infectious disease billing spans inpatient consults, clinic follow-ups, and antimicrobial infusions coded apart from the visit — plus Medicare G0545 when hospital complexity qualifies. Vector Medical Billing, in Jamaica, New York, routes place of service, drug units, and OPAT auth inside the EHR you already use.
98%Published NCR
24hClaim Submission
BAASigned with every client
AAPCCertified coders
AHIMACertified coders
E&OErrors and omissions insured
50 StatesRemote billing nationwide
Monthly fee
What infectious disease billing services include
Full-cycle RCM for ID clinicians who consult in the hospital, manage HIV and hepatitis in clinic, and supervise outpatient parenteral antimicrobial therapy.
The operating cycle matches medical billing services: eligibility and prior auth, charge capture from consult notes and infusion records, ICD-10 / CPT / HCPCS coding, scrub, clearinghouse submission, payment posting, denial management, and A/R follow-up. The scrub watches place of service, consult-vs-follow-up routing, G0545 eligibility on Medicare hospital days, infusion hierarchy and start/stop times, drug units vs dose, JW/JZ, and organism-level diagnosis specificity.
In scope: office/outpatient E/M (± G2211 when Medicare criteria fit), hospital initial and subsequent care, Medicare G0545 add-on when documented, antimicrobial buy-and-bill infusions in office or infusion suite, OPAT coordination with home-infusion vendors, HIV and viral hepatitis longitudinal management with specialty-drug auth, travel and immunization administration when the practice owns the product, and interprofessional consults when another clinician requests advice. Dedicated hospitalist billing covers admitting hospitalists on a separate account — ID consult work stays here. Critical care time belongs on this account only when the ID physician’s documentation supports 99291/99292.
The fee is a percentage of net collections. The written rate is on pricing. Credentialing, a retrospective coding audit, MIPS, and out-of-network / IDR stay separate engagements.
What sits on this infectious disease fee
- Hospital and clinic claims routed by place of service and payer consult policy
- Drug, administration, and visit kept apart on infusion and OPAT days
- HIPAA workflows, a signed BAA, and PHI limited to staff on the account
Where infectious disease claims fail
Common infectious disease billing issues include a consult that is downcoded or sent to the wrong payer, infusion time and drug units left off the claim, and outpatient antibiotic therapy without authorization or the correct site of care.
Consult downcoded or mis-routed
Initial hospital day billed as subsequent care, or consult codes submitted to Medicare (which expects hospital E/M levels instead). Commercial plans that still honor consults get office new/established codes by mistake.
Payer policy and referring-provider documentation decide the path before the claim leaves.
Infusion hours and drug units lost
Therapeutic infusion billed without start/stop times, additional hours dropped, or the antimicrobial J-code omitted while only the visit posts. JW/JZ missing on single-dose vials.
Admin hierarchy and drug lines are separate stories from the E/M.
Auth / site-of-care gaps on OPAT
High-cost IV antimicrobial started without current prior auth for drug, duration, and place of service. Home-infusion S-codes billed by the wrong entity, or physician supervision never charged when the note supports it.
Auth is scrubbed before the first outpatient dose — not after day three.
Hospital · clinic · same account
Inpatient consults and clinic E/M — routed correctly
Consult visits, including inpatient work, are billed by the infectious disease physician when that physician is not the admitting doctor.
Hospital initial care (99221–99223) and subsequent care (99231–99233) follow MDM or time in the note. Same-day admit/discharge families apply when the stay meets those codes. Medicare does not pay the old consult series — use hospital or office E/M levels instead. Commercial and some Medicaid plans still recognize outpatient or inpatient consult codes when documentation shows a request, opinion, and report back to the requesting clinician.
Office and outpatient visits (99202–99215) bill by MDM or time. Medicare G2211 may append when the ID clinician is the continuing focal point for a serious or complex condition — not on every quick return. Prolonged outpatient time uses 99417 when thresholds are met and minutes are documented. Modifier 25 on an infusion day only when a significant, separately identifiable evaluation stands apart from the administration itself.
Consult-day checklist
- Place of service and payer consult policy confirmed
- Initial vs subsequent hospital day supported in the note
- Organism and infection specificity coded — not unspecified sepsis alone when the chart names more
Medicare G0545 — ID hospital complexity add-on
Effective 2025: one add-on per qualifying inpatient or observation day — not for clinic visits.
When it applies
G0545 appends to hospital inpatient or observation E/M (initial, subsequent, or same-day discharge families CMS lists) when an ID-trained physician manages confirmed or suspected infection. CMS recognizes complexity such as transmission-risk mitigation, public-health coordination/testing, and complex antimicrobial counseling. Report once per date of service when criteria are met; it can appear on multiple days of the same admission.
What it is not
Not for office, outpatient clinic, or telehealth. Not a substitute for critical care. Coverage today is Medicare; commercial recognition varies and is checked per plan. The note must show eligible ID complexity for that day — we do not auto-append G0545 to every hospital charge.
IV antimicrobials, OPAT, and drug lines
Administration time, J-codes, waste modifiers, and home-infusion boundaries.
Therapeutic infusion hierarchy
Office or infusion-suite OPAT: 96365 initial hour, 96366 each additional hour when time rules are met, 96367 sequential new drug, 96368 concurrent. Nursing start/stop times support additional hours. Hydration solely to keep the line open typically bundles into the therapeutic infusion.
Drug units + JW / JZ
Bill the antimicrobial by HCPCS unit size with NDC for the product infused (examples include daptomycin, ertapenem, and other high-cost IV agents). Report discarded single-dose drug with JW on a separate line, or JZ when none was discarded. Auth must cover drug, dose, duration, and site of care.
Home OPAT vs physician claim
Home-infusion per-diem S-codes and nursing visits usually belong to the home-infusion pharmacy or agency. The ID physician bills clinic or supervision E/M when documented — not the vendor’s per-diem lines. Medicare coverage for many home IV antibiotics is limited; secondary and commercial benefits are verified before assuming payment.
HIV, hepatitis, and specialty-drug prior auth
Longitudinal MDM, diagnosis precision, and pharmacy-benefit coordination.
Diagnosis and visit complexity
Distinguish asymptomatic HIV status (Z21) from HIV disease (B20) and code manifestations when treated. Chronic hepatitis B and C management visits document viral monitoring, resistance or genotype context when relevant, and drug-interaction review. Performing labs usually bill CD4, viral load, and related tests — the ID note still uses that data for MDM. CCM or TCM add when the practice meets time and care-plan rules; they are not automatic on every HIV panel.
ARVs, DAAs, and site of care
Most antiretrovirals and hepatitis C direct-acting antivirals ride the pharmacy benefit with prior auth — not buy-and-bill on the medical claim. We track auth status and benefits investigation so visits are not delayed by uncovered starts. Buy-and-bill IV antimicrobials stay on the medical claim with J-codes as above. Patient assistance programs are coordinated when coverage is denied; they are not forced into incorrect place-of-service billing.
Infectious disease code families this service works
Illustrative anchors — the note, infusion record, auth, and payer policy decide the final claim.
| Work type | Example | What to check | Common failure if skipped |
|---|---|---|---|
| Office E/M | 99202–99215 ± G2211 | MDM/time; focal-point rules | G2211 on every quick visit |
| Hospital E/M | 99221–99223 / 99231–99233 | Initial vs subsequent; POS | Subsequent on first ID day |
| ID add-on | G0545 | Medicare inpatient/obs only | Appended to clinic visit |
| IV infusion | 96365 / 96366 / 96367 / 96368 | Start/stop; hierarchy | Hours without time docs |
| Antimicrobial drug | J-codes + NDC | Units; product infused | Visit only, drug omitted |
| Waste | JW / JZ | Single-dose vial rules | Missing waste attestation |
| HIV / hepatitis Dx | B20 / Z21 / B18.x | Status vs disease; manifestations | Unspecified infection only |
| Interprofessional | 99446–99452 | Request, time, written advice | Verbal-only undocumented |
| Home OPAT vendor | S9494–S9504 family | Who owns the per-diem | Physician bills vendor lines |
This page does not invent an infectious disease denial percentage. The free audit reads your consult routing, G0545 eligibility, and infusion unit math on the sample you send.
What a free audit line looks like
Illustrative composite only — not a client result and not a promised recovery.
| Field | Example entry |
|---|---|
| Documented service | Medicare inpatient day 2 ID subsequent visit for MSSA bacteremia; complex antimicrobial adjustment and infection-control counseling documented; same afternoon office OPAT daptomycin 500 mg infused 1.2 hours with 0 mg discarded |
| Billed codes | 99232 only on hospital day; office visit 99213 only — no infusion, no drug, no G0545 |
| Issue found | G0545 omitted on qualifying hospital day; OPAT admin and J-code never charged; JZ not reported |
| Recommended correction | 99232 + G0545 on hospital claim; office OPAT: 96365 (+96366 if time supports) + daptomycin J-code units + JZ; E/M-25 only if separately identifiable clinic evaluation stands |
| Related check | OPAT prior auth covers drug, duration, and office site of care |
| Why it matters | Highest-dollar lines and the ID add-on left on the table — caught in scrub or flagged in the free audit |
Request a Free Audit with recent notes, claims, and denials. We map consult, add-on, and infusion lines on your file — not this composite.
How Vector runs infectious disease billing
Setting and auth first — then the same revenue cycle.
1
Assign infectious disease
Coder and biller who already work multi-setting consults, G0545, and antimicrobial units.
2
Reconcile and code
Charge entry and coding from consult and infusion records — queries when time or organism specificity cannot be supported.
4
Post and report
835 posting, denial work, A/R aging, monthly RCM report by hospital vs clinic vs infusion.
Not inside the infectious disease percentage
Related work stays separate so the quote matches the job.
Home-infusion vendor claims
Per-diem S-codes, pumps, and nursing visits owned by the home-infusion pharmacy stay on their NPI. We coordinate so the physician claim does not duplicate those lines.
Credentialing / audit
Credentialing and a retrospective coding audit of G0545 and infusion units are separate engagements when scoped.
Underpay / OON
Underpayment recovery and OON / IDR stay separate when the dispute path is not ordinary denial work.
How infectious disease billing is priced
Percentage of dollars that land — not a flat fee per consult that ignores infusion and add-on leaks.
Written rate
The fee is a percentage of net collections. No setup fee on the monthly cycle. Month to month. The written rate follows hospital vs clinic mix, infusion volume, and how much of the cycle you hand over.
See pricing or request a written rate after the free audit.
What we need to start
EHR access, monthly hospital and clinic census, OPAT and infusion volume, open A/R if you are leaving another biller, and a sample of recent consult or drug denials. Switching usually overlaps so claim submission does not stop. See EHR integration if access setup needs a separate quote.
Audit the ID claims that bill the visit and lose the infusion
Send monthly hospital and clinic volume, OPAT mix, EHR name, and a sample of consult or antimicrobial denials. We reply with what the open A/R shows, whether the monthly fee fits, and a written rate — without inventing a clean-claim percentage.
Written
Monthly rate
98%
Published NCR
50
US States
BAA
Every Client
Infectious disease billing questions
Straight answers tied to the sections above.
What does infectious disease billing include?
Hospital and clinic E/M, Medicare G0545 when criteria are met, antimicrobial drug and administration apart from the visit, OPAT coordination, HIV and hepatitis management with specialty-drug auth, scrubbing, submission, posting, denials, and A/R.
How much do infectious disease billing services cost?
The fee is a percentage of net collections. No setup fee on the monthly cycle. The written rate follows consult mix, infusion volume, and payer mix.
What is HCPCS G0545?
A Medicare add-on for hospital inpatient or observation E/M when ID-trained complexity is documented for confirmed or suspected infection. Once per date of service. Not for office or telehealth visits.
How are OPAT infusions billed?
In office or infusion suite: therapeutic infusion hierarchy codes plus the drug J-code with NDC and JW or JZ. Home per-diem S-codes usually stay with the home-infusion vendor; the physician bills documented supervision or clinic E/M separately.
Are HIV medications billed on the medical claim?
Most oral antiretrovirals and hepatitis C DAAs ride the pharmacy benefit with prior auth. Buy-and-bill IV antimicrobials stay on the medical claim. We do not force pharmacy-benefit drugs onto Part B.
Do we have to change our EHR?
No. Billers work in the system you already use — see EHR integration. Compatibility is confirmed before you commit.
Where does Vector provide infectious disease billing?
The office is 15717 85th St, Jamaica, NY 11414-2620. Work is remote for ID practices in all 50 states. See the specialties hub.
Is Vector Medical Billing HIPAA certified?
HHS does not certify billing companies. Vector signs a BAA, limits PHI to staff on the account, and follows HIPAA workflows. A HIPAA security risk analysis is a separate engagement when scoped.