HCPCS Code B4222: Parenteral nutrition supply kit home mix

Key Takeaways

HCPCS Code B4222 describes a parenteral nutrition supply kit for home mix use, billed per day under the HCPCS Level II B4000-B9999 Enteral and Parenteral Therapy category.

Medicare requires documentation that enteral nutrition was ruled out, tried and failed, or would worsen the patient’s GI dysfunction, plus a qualifying long-term absorption or motility impairment and a written physician order.

B4222 applies to home mix supply kits only; confusing it with B4220 (premix) is a leading denial trigger flagged by CGS Medicare. B4224 is a separate administration kit code billed alongside B4220 or B4222, not a third supply-kit option.

Pabau’s claims management software helps DME suppliers and infusion providers track per-day units, link diagnosis codes, and reduce B4222 claim errors before submission.

HCPCS Code B4222 is the code for a parenteral nutrition supply kit for home mix use, billed once per calendar day. It applies when a caregiver or patient mixes the parenteral nutrition formula at home, rather than receiving it premixed from a pharmacy.

B4222 must be distinguished from B4220, the premix version, and correctly paired with B4224, the separate administration kit code.

This guide covers coverage criteria, ICD-10 support, the fee schedule, documentation requirements, and billing guidelines for B4222, so DME suppliers, home infusion pharmacy billers, and medical coders can bill it accurately.

HCPCS Code B4222: Description and classification

HCPCS Code B4222 carries the official descriptor: Parenteral nutrition supply kit; home mix, per day. It sits within the B4000-B9999 Enteral and Parenteral Therapy section of HCPCS Level II, maintained by the Centers for Medicare and Medicaid Services, or CMS. The code is active and valid for claim submission in 2026.

The “home mix” descriptor is the critical differentiator. It applies when the parenteral nutrition formula is mixed by or under the supervision of a trained caregiver in the home setting, rather than arriving pre-compounded from a pharmacy.

The billing unit is per day: one unit equals one day of supply. Billing more than one unit for a single calendar day is a compliance violation.

B4220, B4222, and B4224: Understanding the difference

Misclassification between the two supply kit codes, B4220 and B4222, is a commonly cited denial trigger in CGS Medicare’s parenteral nutrition billing guidance. B4224 is a related but separate code: the administration kit that’s billed alongside whichever supply kit code applies, not a third supply-kit option chosen by who prepares the formula.

The supplier’s documentation must clearly reflect which preparation method applies to the supply kit. Billing B4222 for a formula that was actually premixed by a pharmacy is a misrepresentation, regardless of whether the result looks the same clinically.

B4224 is billed in addition to the correct supply kit code, not instead of it: a claim for one day of home parenteral nutrition typically carries one supply kit code (B4220 or B4222) plus B4224 for the administration kit. Individual injection supplies, such as syringes billed under A4208, are billed separately from both the supply kit and the administration kit.

Medicare coverage criteria for HCPCS Code B4222

Medicare covers HCPCS Code B4222 under CMS Article A58836 and its related Local Coverage Determination, L38953, when the medical record documents that enteral nutrition has been considered and ruled out, tried and found ineffective, or would exacerbate the patient’s GI dysfunction.

The beneficiary must also have either a small-intestine or exocrine-gland condition that significantly impairs nutrient absorption, or a stomach or intestine motility disorder that impairs nutrient transport or absorption, with the impairment expected to be of long and indefinite duration.

Understanding these criteria upfront reduces claim delays. Patient care management workflows that integrate eligibility verification with documentation capture are especially valuable here, because the coverage requirements must be reflected in the medical record before the first unit is billed.

• Written physician order: A valid, signed order from the treating physician is required before supply kits may be dispensed. The order must specify the diagnosis, the parenteral nutrition regimen, and the duration of therapy.
• GI dysfunction documented: The record must show that enteral nutrition has been considered and ruled out, tried and found ineffective, or would worsen the patient’s condition, and that the impairment (a small-intestine or exocrine-gland absorption disorder, or a motility disorder affecting nutrient transport) is expected to be of long and indefinite duration.
• Home setting: B4222 is billed for supply kits used in the patient’s home. Institutional stays billed under Medicare Part A are not billed separately using HCPCS supply kit codes.
• Enrolled DMEPOS supplier or home infusion provider: Only suppliers enrolled in the DMEPOS program, or home infusion pharmacies under applicable coverage rules, may submit B4222 claims to Medicare.

Non-covered conditions include parenteral nutrition used solely for convenience, weight loss, or short-term postoperative nutritional support where enteral feeding is feasible. Always verify coverage criteria against the current CMS Local Coverage Determination (LCD) applicable to your Medicare Administrative Contractor (MAC) jurisdiction before submitting.

ICD-10-CM diagnosis codes that support B4222

The ICD-10-CM codes listed on the claim must establish medical necessity for home mix parenteral nutrition. The codes below represent commonly covered diagnoses as referenced in CMS guidance; always verify the current LCD for your MAC before submitting, as covered code lists are updated annually.

Include the most specific ICD-10-CM code that reflects the documented clinical condition. A non-specific or unrelated diagnosis code is one of the fastest routes to a medical necessity denial.

For a full, current list of covered diagnoses, refer to the AAPC HCPCS code lookup and cross-reference with your MAC’s LCD for parenteral nutrition. The same specificity standard applies to other DME supply claims, such as ostomy pouches billed under A4425.

Medicare fee schedule and reimbursement for B4222

HCPCS Code B4222 is reimbursed under the Medicare DMEPOS Fee Schedule. Rates are set nationally and adjusted for geographic cost differences using a fee schedule locality multiplier. Because DMEPOS rates are updated each January 1, always verify current allowable amounts against the live CMS DMEPOS fee schedule rather than relying on cached figures.

Durable equipment codes such as E0265 sit on the same fee schedule but follow separate purchase or rental billing rules that do not apply to per-day supply kits like B4222.

Use the CMS DMEPOS Fee Schedule, or your DME MAC’s published fee schedule, to look up the current Medicare allowable amount for B4222 by locality.

• Billing unit: One unit per day. Do not bill multiple units for a single calendar day.
• Competitive bidding: Parenteral nutrition supply and administration kits (B4220, B4222, B4224) are statutorily excluded from the DMEPOS Competitive Bidding Program. There is no CBA to check for these codes; B4222 is reimbursed at the standard DMEPOS fee schedule rate nationwide, adjusted only for the geographic locality multiplier.
• Secondary payer coordination: When Medicare is primary and a secondary payer exists (Medicaid, supplemental insurance), bill Medicare first and apply the crossover rules for the remaining balance.

For a free HCPCS code lookup, PGM Billing’s lookup tool pulls CMS code and description data from 2015 and does not publish fee figures. For current reimbursement amounts, use the CMS DMEPOS Fee Schedule linked above.

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Documentation requirements for billing B4222

Medicare documentation for HCPCS Code B4222 must support every unit billed. A claim with missing or incomplete documentation will be denied on audit, and the supplier bears the burden of proof. Solid claims management software that links documentation to each claim line reduces that exposure significantly.

• Written physician order: Must include patient name, diagnosis, parenteral nutrition formula components, infusion rate, frequency, and expected duration. Verbal orders must be followed by a written order within the timeframe required by your MAC.
• Certificate of medical necessity (CMN/DIF): CMS eliminated the CMN/DIF requirement nationally for parenteral and enteral nutrition claims with dates of service on or after January 1, 2023 (MLN Matters SE22002). No CMN/DIF is filed with the claim, but the medical necessity information it used to capture (diagnosis, PN regimen, expected duration) must still exist in the patient’s medical record and be available on audit.
• Delivery confirmation: Documentation must confirm that supply kits were delivered to the home and received by the patient or caregiver. Delivery tickets or electronic delivery records serve this purpose.
• Daily usage logs: Records supporting daily use are required when billing per-day units across a long-term course. Missing usage logs are a frequent audit finding for extended PN therapy.
• Progress notes: Ongoing clinical notes from the treating physician confirming continued medical necessity must be available for audits covering extended therapy periods.

Home infusion providers that use digital intake forms for clinical documentation can capture structured delivery confirmations and usage logs that are immediately accessible for audits.

Alongside this, strong HIPAA-compliant documentation practices ensure that PN records are stored and transmitted securely, protecting both the patient and the supplier.

Billing guidelines and modifiers for B4222

Billing HCPCS Code B4222 correctly requires attention to unit reporting, modifier use, and place-of-service coding. The per-day billing unit is fixed: one unit equals one day of home parenteral nutrition supply kit use. Review the CGS Medicare coding guidance for the most current MAC-specific requirements before submitting.

Suppliers involved in mobile IV therapy billing will recognize similar per-unit complexity. The principles of unit accuracy, modifier selection, and place-of-service coding apply across infusion therapy billing categories.

Equipment purchase and rental modifiers, such as NU (new equipment) and RR (rental), apply to durable medical equipment and do not apply to per-day consumable supply and administration kit codes like B4220, B4222, and B4224.

Common denial reasons for B4222

• Missing or expired physician order at time of service
• Incorrect supply kit code (B4220 billed when home mix applies, or B4222 billed when premix applies)
• Units of service exceeding one per day
• ICD-10-CM diagnosis code not on the covered list for the applicable LCD
• No delivery confirmation in the records
• Supplier not enrolled in DMEPOS for the applicable jurisdiction
• KX modifier missing when required by MAC policy

Who can bill HCPCS Code B4222

Not every provider type is eligible to submit B4222 claims to Medicare. Eligibility is tied to DMEPOS enrollment status and the type of service being provided. Many code-lookup resources describe what the code covers, but not who is permitted to bill it.

If you are opening a home infusion clinic, understanding DMEPOS enrollment requirements before the first parenteral nutrition patient is admitted avoids billing compliance issues from day one.

Separately, who administers IV therapy in your state affects clinical scope, which in turn affects which billing codes apply to your specific service model.

• Enrolled DMEPOS suppliers: DME suppliers with a valid DMEPOS supplier number for the service area may bill B4222 under the DMEPOS fee schedule.
• Home infusion pharmacies: Under the Medicare Part D home infusion therapy benefit (effective 2021), qualifying home infusion pharmacies may bill for professional services, but supply kit codes like B4222 continue to be billed under Part B DMEPOS rules. Confirm with your MAC which entity bills the supply kit versus the professional service; programs run at scale often rely on infusion center software to keep eligibility and billing aligned.
• Hospital-based home health agencies: These entities are generally not eligible to bill DMEPOS codes separately for home patients already covered under a Medicare home health episode.
• Physicians and non-physician practitioners: Ordering the parenteral nutrition does not confer billing rights for the supply kit. Only enrolled DMEPOS suppliers or eligible home infusion entities may bill B4222.

For providers building infusion programs, reviewing infusion therapy best practices alongside billing guidelines ensures operational and compliance decisions develop together.

Teams managing infusion billing workflows at scale benefit from infusion therapy documentation workflows built into their clinical system, so billing records and clinical notes are always linked.

Conclusion

HCPCS Code B4222 is a narrow, specific code. It covers home mix parenteral nutrition supply kits, billed per day, for Medicare beneficiaries whose enteral nutrition has been ruled out, tried and failed, or would worsen their GI dysfunction, and who have a qualifying long-term absorption or motility impairment.

Getting the code right means correctly distinguishing B4222 from B4220, correctly co-billing B4224 alongside whichever supply kit code applies, supporting every unit with a compliant physician order and delivery confirmation, and verifying your MAC’s covered diagnosis list each year.

Pabau’s claims management software helps DME and home infusion billing teams link diagnosis codes, track per-day units, and catch missing documentation before claims are submitted. To see how it fits your workflow, book a demo with the team.

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