HCPCS

# HCPCS Code E1399: Complete Documentation and Billing Requirements Explained

- May 9, 2025
- Posted by Brian Bertrand

25 Apr

Within highly structured coding frameworks, some level of adaptability remains essential within their tightly regulated environment. The medical billing system includes E1399 as its required classification code. Specific items or services find their HCPCS Level II codes, while E1399 functions as a different coding solution. Durable medical equipment that remains uncategorized by the Centers for Medicare & Medicaid Services (CMS) can be placed under the E1399 code. HCPCS Code E1399 serves an essential role within current healthcare environments because medical innovations move beyond policy changes.

Federal hospitals utilize E1399 as a tool for reimbursement access between modern medical equipment and their approved benefit programs. The combination of Healthcare providers, along with DME suppliers and billing specialists, faces situations that require them to navigate products or devices that lack their own Healthcare Common Procedure Coding System (HCPCS) code. The “Durable Medical Equipment Miscellaneous” code E1399 serves critical functions when no other HCPCS code exists. The following information provides a thorough breakdown of E1399 by analyzing its functionality and necessary documentation alongside appropriate billing methods, together with reimbursement aspects, along with proven techniques to improve payment success. This SEO-optimized, detailed article provides both industry professionals and curious readers with extensive information about E1399 within healthcare billing frameworks.

## What is HCPCS Code E1399?

The HCPCS E1399 miscellaneous code enables billing for durable medical equipment that lacks detailed designated codes. E1399 functions as a general classification for medical equipment that cannot be assigned an established Medicare code. The code E1399 functions for billing new and customized medical equipment, as well as approved but uncoded accessorizing devices, according to FDA regulations.

## When Should E1399 Be Used?

The utilization of E1399 requires careful evaluation before determining its application. We can only use E1399 as an option when no HCPCS code exists for the subject item. E1399 becomes necessary for new or highly customized medical equipment that CMS does not recognize at present.

The treatment needs of a patient who requires a cutting-edge neuromuscular electrical stimulation (NMES) unit for home healthcare present an appropriate situation to use E1399. The choice of the E1399 code could prove valid for billing purposes when a patient requires a specific NMES device having unique features that substantially differ from listed codes.

Healthcare providers should reserve the use of the E1399 code whenever they lack any medical practice specialty code available for billing the DME medical device. The use of E1399 occurs when there is no other health care procedural coding system available for these particular scenarios:

- New technology: The medical device or accessory belongs to a fresh category of enterprise that does not receive a designated medical code.
- Custom equipment: Custom-fabricated or modified DME items.
- Unique features: Unusual equipment components do not have standard HCPCS code identification.
- Accessories and add-ons: If an accessory or component of DME exists without a separate description elsewhere, then E1399 should be applied for billing purposes.

## Why Use E1399?

Suppliers or healthcare providers select E1399 as an imprecise code in specific situations.

### 1. Lack of Assigned Code

A product that CMS has not yet released its specific procedural code requires the use of E1399. In these cases, E1399 steps in.

### 2. Customized Equipment

Any wheelchair equipped with distinctive padding in combination with special control systems and additional modifications requires coding with E1399. The distinctive equipment design probably does not match any available HCPCS codes.

### 3. One-Off Devices

Some patients may require equipment for which medical coding systems do not provide a specific billing code because of its highly specific nature to their condition.

### 4. Avoiding Coding Errors

The E1399 code works as an alternative to prevent both upcoding and miscoding by not attempting to match square pegs with round holes.

## Documentation and Billing Requirements for HCPCS Code E1399

Health Care Procedure Coding System code E1399 functions as a miscellaneous solution to bill durable medical equipment when no dedicated HCPCS code exists. Strict documentation, together with billing rules, needs to be followed since E1399 functions as a general billing code.

### 1. Modifiers Required

Every transaction documentation needs a modifier that specifies its nature between new purchases and rentals to proceed.

- –NU for a new purchase
- –RR for rental

Every E1399 claim requires a required modifier that specifies the purchase or rental status of the item.

### 2. Detailed Item Description

Every claim needs to contain a short and straightforward description of the purchased item.

Claim documentation must state all functional aspects of the product with a breakdown of features that make it ineligible for existing HCPCS coding. Healthcare facilities should add this information to the NTE segment on electronic claims and Item 19 on paper claims.

### 3. Supporting Documentation

The request for medical necessity documentation must be provided with all submission materials. This often includes: Provided documentation includes patient medical records, together with clinical notes that outline the patient’s necessary item requirements. The documentation must include product specifications from both the manufacturer including the model name. Medical necessity documentation for Medicare, along with several insurance providers, must prove three things:

## Summary Table of Key Documentation and Billing Requirements for E1399

Requirement | Details
Use condition | Only when no specific HCPCS code exists for the item
Modifiers | –NU (purchase), –RR (rental) required
Item description | Detailed description of claim (NTE segment or Item 19)
Supporting documentation | Physician order, medical records, product info, supplier invoice
Charges | Usual/customary charge; include delivery, shipping, and fitting fees in the total charge
Rental billing | Use actual rental dates; one-day rental uses the same first/last date.
Attachments | Submit via electronic portals or fax with proper claim indicators (PWK segments or Item 19)
Medical necessity | Must be documented and justified for diagnosis/treatment
Coverage criteria | The item must meet Medicare benefit category and regulatory requirements (for Medicare)

## Medicare vs. Private Payers: Navigating the Differences

E1399 billing fundamentals can be used for both Medicare and private insurance systems, yet specific operational requirements exist between them. Medicare involves strict rules together with specified medical necessity criteria, including the DMEPOS (Durable Medical Equipment, Prosthetics, Orthotics, and Supplies) benefit. Private insurance companies follow their own set of prior authorization policies, which also depend on their contracted terms.

The DMEPOS program under Medicare needs suppliers to complete both accreditation and program enrollment to submit E1399 claims. The approval process through private insurers demonstrates greater adaptability provided that clinical outcome measures show successful patient results.

## Reimbursement Challenges: What Providers Need to Know

Payment reimbursements under E1399 lack standardization, thus, payments range widely between claims. Suppliers provide the information necessary for Medicare contractors and private insurance adjusters to evaluate different cases based on documentation.

The major provider challenge stems from claim underpayments and rejections through the “lack of specificity” evaluation. The vague nature of E1399 claims leads payers to conduct reviews since the code fails to provide enough details about the billed item. Missing details about necessity and pricing within documentation will lead insurers to either deny payment or reduce their payments, or delay their payments. Each E1399 claim needs treatment as an independent medical record audit to prevent payment issues. Derive answers to payer questions in advance of their inquiries. Documentations providing all required information about who performs the service, combined with what service was provided, why this service is necessary, and showing the exact cost, lead to quicker and more complete reimbursement payment.

## Best Practices for Submitting E1399 Claims

To maximize the likelihood of claim approval and timely reimbursement:

- Provide thorough descriptions: Avoid vague language. Specify the item’s function, unique features, and clinical rationale.
- Include supporting documentation: Attach medical records, physician’s orders, and any relevant clinical notes.
- Submit manufacturer’s pricing: This establishes the basis for reimbursement.
- Reference related codes: If a similar item exists, explain why that code is insufficient.
- Stay current on payer policies: Requirements can vary between Medicare, Medicaid, and private insurers

### Conclusion

Despite the broad nature of HCPCS E1399, the code continues to be essential for medical billing operations. The E1399 code enables providers to introduce novel or tailored DME solutions before an official CMS code assignment is established. The freedom of usage through E1399 creates new obligations for medical providers.

From meticulous documentation to proactive communication with payers, the success of an E1399 claim hinges on the clarity and completeness of the billing package. Medical providers who invest time in decoding code E1399 while viewing each submission as an opportunity to create impactful medical narratives succeed in obtaining proper reimbursement faster.

The E1399 code serves all unique medical devices, yet proper documentation functions as the biller’s most critical tool.

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