CPT® Code 96365

Last Updated: January 2026 | Verified for 2026 AMA, CPT & CMS Guidelines

Quick Reference: CPT 96365

• Definition: Initial intravenous infusion, for therapy, prophylaxis, or diagnosis (non-chemotherapy drug); covers administration of a medication or substance up to one hour for treatment or diagnostic purposes .
• Duration: Represents the first 60 minutes of IV infusion time (requires >15 minutes of infusion). Infusions ≤15 minutes are coded as an IV push (96374) . Time beyond 1 hour is reported with add-on code +96366 for each additional hour.
• Frequency: Only one initial infusion code (96365) is billable per patient per day per IV access site. Additional infusions in the same IV line are billed with sequential (96367) or concurrent (96368) add-on codes . If a second separate IV line is established, a second initial 96365 may be reported with modifier -59 (distinct) .
• Included Services: Routine infusion supplies and techniques are bundled. IV start, catheter access, standard tubing/syringes, and flushing at conclusion are not billed separately – these are included in 96365 .
• Exclusions: Do not use 96365 for chemotherapy drugs (separate codes 96413, etc.) or for purely hydration therapy (use 96360/96361). Infusions that last 15 minutes or less should be coded as an IV push (96374) instead of 96365 . CPT 96365 is the primary code for the initial hour of non-chemotherapy IV infusion therapy. It’s used for administering therapeutic or diagnostic substances via intravenous infusion – for example, IV antibiotics, monoclonal antibodies, or IV iron treatments. This code was introduced as part of the drug administration CPT code revisions (separating initial vs. subsequent infusions) and remains in effect through 2026 with no descriptor changes. Key guidelines specify that only one initial infusion code is reported per encounter, with any additional infusion services coded using the appropriate add-on codes. Notably, an infusion must run longer than 15 minutes to qualify as 96365 – shorter IV administrations are considered IV pushes (96374) per CPT definition . Proper usage of 96365 requires careful attention to infusion start/stop times and adherence to the CPT infusion hierarchy rules, as outlined below .

1. Infusion Time Criteria & Code Hierarchy

Under CPT guidelines, selection of an infusion code is driven by the duration of the infusion and the sequence of services (initial vs. subsequent). Code 96365 covers the first hour of infusion time for the primary drug or substance given during a visit. Several critical timing rules and hierarchy principles determine how to bill multiple infusions .

1. Minimum Time for Initial Hour

To report 96365, the IV infusion must last beyond 15 minutes. An infusion of 15 minutes or less is not billed as 96365; it is considered an IV push and should be coded as 96374 (IV injection) . If an infusion runs at least 16 minutes, it qualifies as an infusion service. CPT defines one hour of infusion as anything up to 90 minutes – i.e. from 16 minutes up to 1 hour 30 minutes counts as one unit of 96365 . Only when an infusion exceeds 90 minutes can an additional hour code be billed. In practice, this means:

• 16 to 90 minutes: Bill one unit of 96365 (covers the first hour of infusion).
• 91+ minutes: Bill 96365 plus add-on +96366 for each full or partial additional hour beyond the first. An additional hour code is allowed once the infusion goes >30 minutes into the next hour (i.e. at least 91 minutes total) . For example, a 2-hour (120 minute) infusion is coded 96365 x1 and 96366 x1. If multiple substances are infused through the same IV line, only one can be coded as the initial hour – the others will use add-on codes as described below .

2. Multiple Infusions: Initial vs. Add-On Codes

CPT drug administration rules mandate that for any encounter with multiple infusions/injections, you report only one “initial” code, and all other services are coded as subsequent add-ons . The determination of which service counts as initial follows a hierarchy:

• For facility (hospital outpatient) coding: an explicit hierarchy is used. Chemotherapy infusions rank highest, then non-chemo therapeutic infusions (96365), then IV pushes, then injections, and lastly hydration . The highest-ranked service provided should be coded as the initial service, regardless of the chronological order.

• For physician office coding: the initial code is generally the primary reason for the visit (e.g., if the patient came for an IV immunotherapy infusion and also received a hydration IV, the immunotherapy is primary and gets the initial code) . After designating the initial infusion, additional infusions are coded as follows:

• Additional Hour(s) – Code +96366: Used for time beyond the first hour of the same infusion. Each additional hour (or part >30 min) of the primary infusion is coded with +96366 . This add-on is only for continuing the original substance infusion.

• Sequential Infusion – Code +96367: Used for a new drug or substance infused after the primary infusion is completed. This add-on code covers the first up to 1 hour of a second (different) infusion given in sequence through the same IV access .

• Concurrent Infusion – Code +96368: Used when a different drug or substance is infused simultaneously with another infusion through the same IV access (e.g., two IV infusions running at the same time via a Y-site or multi-lumen catheter). This add-on is not time-based – it is reported only once per encounter/day no matter how long the concurrent infusion runs . Separate IV Lines: In rare cases, a patient may have two separate IV lines (separate access sites) in one visit. In such cases, it is permitted to bill a second initial infusion code for the second line – Medicare typically requires a modifier (e.g. -59 or -XS) to indicate a distinct IV site . Documentation must support that two separate IV access sites were medically necessary (e.g. incompatible drugs that could not run through one IV). If the patient simply pauses and restarts an infusion in the same line on the same day, this is not a new initial service (it would be a continuation or sequential, not a separate encounter).

2. Audit-Proof Documentation Standards

Accurate and detailed documentation is critical for infusion services. Because infusion codes are time-based and often have multiple components, auditors will closely examine notes for compliance. To “audit-proof” your documentation for 96365 and related codes, ensure the following elements are clearly recorded :

• Physician Order: There must be a valid order for the infusion, including the drug name, dose, route, and rate. Verbal orders should be signed by the provider within 48 hours as required .
• Start and Stop Times: Document the exact start and end times for each infusion. These times determine the billable hours. Missing stop times can lead to defaulting the service to an IV push (15 min or less) in the eyes of payers . If no stop time is documented, the infusion may only be coded as a short injection or not at all, which is a costly error in billing .
• Substance and Dose: Clearly specify what drug or fluid was infused, the concentration, total volume, and dose (e.g., “Infliximab 300 mg in 250 mL NS”). Also note the route (IV) and infusion method.
• Patient Monitoring & Response: Document patient monitoring and any adverse reactions or lack thereof. If interventions occurred (e.g., slowing rate due to reaction), include those details.
• Sequential/Concurrent Details: If multiple infusions occurred, document the sequence and overlap. This supports the use of add-on codes 96367/96368 .
• Inclusive Services: Document IV catheter insertion/site and flushing, but remember these are part of the infusion service (not separately billable) .
• E/M Services (if applicable): If an E/M service is provided beyond routine infusion checks, clearly document the separate work. Medicare will not allow a low-level E/M (99211) on the same day just for IV monitoring or starting an IV – that work is considered part of the infusion service . In summary, your documentation should paint a complete picture of the infusion encounter: what was given, how long it ran, who gave it, and how the patient did. Explicitly list each infusion’s timing and drug details. Well-structured infusion notes not only justify the CPT codes (for proper payment) but also support safe patient care continuity.

3. Common ICD-10 Diagnosis Codes for Infusions

CPT 96365 is a procedure code and does not tie to one specific diagnosis; it can be used for any condition requiring intravenous therapy. However, medical necessity for an infusion must be supported by an appropriate ICD-10 diagnosis. Below are examples of conditions frequently associated with therapeutic infusions (and that typically justify the need for IV administration):

• A41.9 – Sepsis, unspecified organism: Severe systemic infection often requiring broad-spectrum IV antibiotics. Patients with sepsis are commonly treated with prolonged IV antibiotic infusions multiple times per day .
• D50.9 – Iron deficiency anemia, unspecified: Significant iron deficiency unresponsive to oral iron may be managed with IV iron infusions .
• M05.79 – Rheumatoid arthritis (RA) of multiple sites with rheumatoid factor: Moderate-to-severe RA is often treated with biologic agents via IV infusion. In one coding example, RA (M05.79) was used for an IV infusion visit involving Rituximab; saline used to administer the drug was not separately billable, as it was part of the infusion service .
• D80.9 – Immunodeficiency, unspecified: Patients with antibody deficiencies receive regular IV immunoglobulin infusions (IVIG). 96365 is used for the initial hour of IVIG administration .
• J18.9 – Pneumonia, unspecified organism: Serious pneumonia can necessitate IV antibiotic therapy, especially if oral antibiotics are not sufficient or if the patient is hospitalized. These are examples; many other diagnoses might require IV infusions. Always ensure the ICD-10 code reported reflects the condition that makes the IV infusion medically necessary. Documentation should clearly link the diagnosis to the decision to administer intravenous therapy.

4. Medicare Coverage & Same-Day Billing Rules

Medicare follows CPT guidelines for infusion coding, with additional payer-specific policies. The overarching principle is that Medicare (and most insurers) will pay for only one initial infusion code per patient per day in a given setting, and that duplicate or unmatched services will be denied.

The “One Initial Infusion” Rule: Medicare allows only one initial administration code per patient per day (per venous access site) .

Scenario: A patient receives an IV antibiotic infusion at 10:00 AM, and later that day a second different IV medication is infused at 4:00 PM through the same IV line.

Action: Do not bill 96365 twice. Instead, combine the services: bill 96365 once for the first infusion, and use the appropriate add-on code for the second infusion (e.g., +96367 for a sequential infusion of a new drug) . If, however, the second infusion was given through a completely separate IV line (different anatomical site), you may bill a second 96365 with modifier 59 (or XS) to indicate a distinct encounter/site .

Hospital Facility vs. Physician Billing

Medicare distinguishes between facility charges and professional services for infusions. If an infusion is provided in a hospital outpatient setting or ER, the facility will report the infusion codes (96365, etc.) for reimbursement, and the physician will not separately bill 96365 in that case . In a physician’s office/clinic, the practice can bill 96365 and receive payment for infusion administration, subject to supervision requirements.

Same-Day Multiple Encounters

If a patient has more than one infusion encounter on the same date, Medicare generally expects that only one initial code is billed per day in the same setting. Exceptions may apply for truly distinct settings/providers or distinct IV access sites. Medicare NCCI edits may flag two initial infusion codes on the same day as duplicative unless properly modified and supported .

E/M Services on Infusion Days

Medicare bundles routine pre- and post-infusion work into the infusion codes. Do not bill 99211 (nurse visit) for the act of starting an IV or observing an infusion – Medicare will deny it as unbundled . E/M on the same day is payable only if a distinct service is performed; append modifier 25 to the E/M and ensure documentation supports the separate work. Finally, Medicare requires that infused drugs be reported with HCPCS drug codes in addition to administration codes. The 96365 code covers administration only; the medication itself is billed separately.

5. Modifier Usage in Infusion Coding

Modifiers are often necessary to reflect distinct circumstances. Below are common modifiers relevant to 96365 and related codes.

Modifier 59 (Distinct Procedural Service)

Modifier -59 is used to indicate that an infusion service is separate and distinct from other services on the same day. For 96365, -59 is most often applied if you need to report a second initial infusion due to a separate IV site or separate encounter . Some payers prefer the “X” modifiers (e.g., -XS, -XE) for clarity .

Modifier 25 (Significant Separate E/M on Same Day)

Use modifier -25 on an E/M code if a separately identifiable E/M service is provided on the same date as the infusion. Without it, Medicare will typically deny the E/M as bundled into the infusion service .

Modifier 79 (Unrelated Procedure During Global Period)

Modifier -79 is used when an infusion is performed during the postoperative global period of a surgery but for a completely unrelated reason. This indicates the infusion should be paid separately and not considered part of the global package .

Modifier GC (Teaching Physician Service)

In an academic setting, modifier -GC may be required on Medicare claims to indicate resident involvement under teaching physician direction . Documentation should include the appropriate teaching attestation.

6. Global Period Considerations

Infusion administration codes (96365 and add-ons) have a global period of 0 days. However, infusion services may be denied as included if they are related to postoperative care under another procedure’s global period. If an infusion is unrelated to the original surgery and performed by the same physician/group, modifier 79 supports separate payment .

If the infusion is provided by a different physician than the surgeon (and not in the same specialty group), that physician is generally not bound by the surgeon’s global period for billing.

7. Detailed Comparison: 96365 vs 96366 vs 96367 vs 96368

Note: Codes 96366, 96367, 96368 are add-on codes and cannot be reported without an initial primary code. Hydration infusions (96360/96361) and chemotherapy administrations (96413, etc.) are separate code families with their own rules, and they may take precedence as “initial” in facility hierarchy .

8. Complex Clinical Scenarios

To solidify understanding, here are scenario-based examples demonstrating how CPT 96365 and its related codes are applied in real clinical situations:

Scenario 1: Two-Hour IV Infusion (Additional Hour Needed)

Patient: 58-year-old with immunodeficiency receiving an IVIG (immune globulin) infusion in an outpatient infusion center.

Infusion Details: IVIG started at 08:00 and completed at 10:00. Total infusion time = 120 minutes (2 hours).

Coding: 96365 x1 (initial up to 1 hour) + 96366 x1 (each additional hour).

Rationale: The infusion exceeded 90 minutes, so it qualifies for an additional hour code. Documentation of start/stop times substantiates the 2-hour duration .

Scenario 2: Sequential IV Antibiotics

Patient: Hospital outpatient with diagnosis of sepsis due to intra-abdominal infection. Receiving combination IV antibiotic therapy.

Infusion Details: First, IV ciprofloxacin is infused from 14:00 to 14:50 (50 minutes). Upon completion, through the same IV line, IV metronidazole is infused from 15:00 to 15:30 (30 minutes).

Coding: 96365 (initial infusion for ciprofloxacin, 50 min) + 96367 (sequential infusion for metronidazole, 30 min).

Rationale: Two different drugs were given in succession through one IV site; the second drug is coded as sequential infusion .

Scenario 3: Concurrent Infusions via Dual Lumen

Patient: ICU patient in septic shock, requiring multiple urgent IV medications concurrently.

Infusion Details: The patient has a double-lumen central IV line. At 10:00, IV Norepinephrine (vasopressor) is started in one lumen (continuous infusion) and IV Vancomycin is started in the second lumen at the same time. Both infuse concurrently from 10:00 to 11:00 (overlap for 60 minutes).

Coding: 96365 (initial infusion – assign to the more resource-intensive drug, e.g., Vancomycin) + 96368 (concurrent infusion for the other drug running at the same time).

Rationale: Two infusions overlapped; report concurrent infusion once per day .