A4398 HCPCS code: Ostomy irrigation supply; bag, each
A4398 is the HCPCS Level II code for ostomy irrigation supply; bag, each. The 2026 Medicare DMEPOS fee schedule pays $17.10 to $22.19 depending on the state. Its Medicare coverage code is D (Special coverage instructions apply): Medicare covers it when its national or local coverage criteria are met. The NCCI unit limit is 1 per day on DME suppliers. Medicare volume fell 19% from 2022 to 2024 (1,636 to 1,328 services). In 2024, 118 suppliers billed Medicare for A4398 (purchases), serving 699 beneficiaries; California, Florida, Texas accounted for 27% of services. Its average fee ranks 46 of 68 A43 codes (family range $0.05–$878.06).
Code details
| Field | Value |
|---|---|
| Section | A codes — Transportation, medical/surgical supplies and miscellaneous |
| Coverage code | D — Special coverage instructions apply |
| Pricing indicator | 37 — DMEPOS: ostomy, tracheostomy and urological supplies |
| BETOS category | D1F — Prosthetic and orthotic devices |
| Added | 1989-01-01 |
| Last action effective | 1997-01-01 |
2026 Medicare DMEPOS fee schedule for A4398
| Modifier | Meaning | Lowest state fee | Highest state fee | Ceiling | Floor |
|---|---|---|---|---|---|
| — | base fee | $17.10 | $22.19 | $19.70 | $16.75 |
| State | Modifier | Fee | Rural fee |
|---|---|---|---|
| AK | — | $19.91 | — |
| AL | — | $18.51 | — |
| AR | — | $19.70 | — |
| AZ | — | $19.70 | — |
| CA | — | $19.70 | — |
| CO | — | $19.35 | — |
| CT | — | $19.70 | — |
| DC | — | $19.70 | — |
| DE | — | $19.70 | — |
| FL | — | $19.70 | — |
| GA | — | $18.05 | — |
| HI | — | $21.28 | — |
| IA | — | $19.70 | — |
| ID | — | $19.70 | — |
| IL | — | $19.70 | — |
| IN | — | $19.70 | — |
| KS | — | $19.70 | — |
| KY | — | $17.92 | — |
| LA | — | $19.70 | — |
| MA | — | $19.35 | — |
| MD | — | $19.70 | — |
| ME | — | $19.35 | — |
| MI | — | $19.70 | — |
| MN | — | $19.70 | — |
| MO | — | $19.70 | — |
| MS | — | $19.70 | — |
| MT | — | $19.70 | — |
| NC | — | $19.70 | — |
| ND | — | $18.05 | — |
| NE | — | $19.70 | — |
| NH | — | $18.33 | — |
| NJ | — | $19.70 | — |
| NM | — | $19.70 | — |
| NV | — | $19.70 | — |
| NY | — | $19.70 | — |
| OH | — | $19.70 | — |
| OK | — | $19.70 | — |
| OR | — | $19.70 | — |
| PA | — | $19.70 | — |
| PR | — | $22.19 | — |
| RI | — | $18.33 | — |
| SC | — | $19.70 | — |
| SD | — | $18.05 | — |
| TN | — | $19.70 | — |
| TX | — | $17.10 | — |
| UT | — | $19.70 | — |
| VA | — | $17.36 | — |
| VI | — | $19.70 | — |
| VT | — | $19.11 | — |
| WA | — | $19.70 | — |
| WI | — | $19.70 | — |
| WV | — | $19.70 | — |
| WY | — | $18.05 | — |
How the A4398 fee compares
| Measure | Value |
|---|---|
| Rank among 68 A43 codes (lowest = 1) | 46 |
| Family fee range (average of state fees) | $0.05–$878.06 |
| Rural fee uplift | — |
Who bills A4398 (2024)
| Measure | Value |
|---|---|
| Suppliers billing rentals | — |
| Suppliers billing purchases | 118 |
| Referring clinicians | 709 |
| Medicare beneficiaries | 699 |
| States with claims | 34 |
| Share of services in top 3 states (California, Florida, Texas) | 27% |
| Year | Suppliers | Beneficiaries |
|---|---|---|
| 2022 | 143 | 883 |
| 2023 | 133 | 759 |
| 2024 | 118 | 699 |
Counts only. Supplier and clinician names, contact lists and state-by-state detail are in Caduvo.
Medicare utilization for A4398, 2022–2024
| Year | Services | Beneficiaries | Avg. allowed | Avg. paid |
|---|---|---|---|---|
| 2022 | 1,636 | 883 | $16.55 | $12.31 |
| 2023 | 1,398 | 759 | $17.96 | $13.16 |
| 2024 | 1,328 | 699 | $18.43 | $13.48 |
States with the most A4398 services (2024)
| State | Services | Avg. paid |
|---|---|---|
| California | 127 | $14.29 |
| Florida | 109 | $13.62 |
| Texas | 100 | $12.30 |
| New York | 64 | $13.85 |
| Virginia | 59 | $12.01 |
NCCI unit limits (MUE)
| Claim type | Max units per day | Rationale |
|---|---|---|
| DME suppliers | 1 | Published Contractor Policy |
| outpatient hospital claims | 2 | Clinical: CMS Workgroup |
Medicare policy articles for this code
- A52487: Ostomy Supplies - Policy Article (CGS Administrators, LLC (DME MAC) Noridian Healthcare Solutions, LLC (DME MAC)) — mentions this code in its coding guidance
Covered diagnoses (10 ICD-10-CM codes)
The diagnoses most often listed as covered in the policy articles above:
| ICD-10-CM | Diagnosis | Articles listing it |
|---|---|---|
| K94.00 | Colostomy complication, unspecified | 1 |
| K94.03 | Colostomy malfunction | 1 |
| K94.10 | Enterostomy complication, unspecified | 1 |
| K94.13 | Enterostomy malfunction | 1 |
| Z43.2 | Encounter for attention to ileostomy | 1 |
| Z43.3 | Encounter for attention to colostomy | 1 |
| Z43.6 | Encounter for attention to other artificial openings of urinary tract | 1 |
| Z93.2 | Ileostomy status | 1 |
| Z93.3 | Colostomy status | 1 |
| Z93.6 | Other artificial openings of urinary tract status | 1 |
What changed for A4398
- 2026-01-01: Average state fee rose 2.0%: $19.04 to $19.42
- 1989-01-01: A4398 added to HCPCS Level II
- Next scheduled CMS quarterly update (HCPCS and DMEPOS fee schedule): 2027-01-01
Frequently asked questions
What is HCPCS code A4398?
A4398 is the HCPCS Level II code for ostomy irrigation supply; bag, each. Short descriptor: "Ostomy irrigation bag".
How much does Medicare pay for A4398?
Under the 2026 DMEPOS fee schedule, non-rural state fees are base (base fee): $17.10–$22.19. Rural fees can be higher.
Does Medicare cover A4398?
Coverage code D — Special coverage instructions apply. Medicare covers it when its national or local coverage criteria are met.
Which diagnoses support coverage for A4398?
Medicare policy articles that cite A4398 list 10 covered ICD-10-CM diagnosis codes across 1 article. The most cited include K94.00 (Colostomy complication, unspecified), K94.03 (Colostomy malfunction), K94.10 (Enterostomy complication, unspecified). A listed diagnosis is necessary but not sufficient; the policy's other criteria still apply.
Did the Medicare fee for A4398 change in 2026?
The average non-rural state fee moved from $19.04 in 2025 to $19.42 in 2026 (+2.0%). CMS's next quarterly HCPCS and DMEPOS update takes effect January 1, 2027.
How many units of A4398 can be billed per day?
1 on DME suppliers; 2 on outpatient hospital claims (NCCI medically unlikely edits).
Related A43 codes
- A4300 — Implantable access catheter, (e.g., venous, arterial, epidural subarachnoid, or peritoneal, etc.) external access
- A4301 — Implantable access total catheter, port/reservoir (e.g., venous, arterial, epidural, subarachnoid, peritoneal, etc.)
- A4305 — Disposable drug delivery system, flow rate of 50 ml or greater per hour
- A4306 — Disposable drug delivery system, flow rate of less than 50 ml per hour
- A4310 — Insertion tray without drainage bag and without catheter (accessories only) ($9.36–$25.22)
- A4311 — Insertion tray without drainage bag with indwelling catheter, foley type, two-way latex with coating (teflon, silicone, silicone elastomer or hydrophilic, etc.) ($16.05–$28.00)
- A4312 — Insertion tray without drainage bag with indwelling catheter, foley type, two-way, all silicone ($21.85–$36.59)
- A4313 — Insertion tray without drainage bag with indwelling catheter, foley type, three-way, for continuous irrigation ($22.44–$40.49)
- A4314 — Insertion tray with drainage bag with indwelling catheter, foley type, two-way latex with coating (teflon, silicone, silicone elastomer or hydrophilic, etc.) ($30.63–$41.77)
- A4315 — Insertion tray with drainage bag with indwelling catheter, foley type, two-way, all silicone ($31.95–$48.37)
- A4316 — Insertion tray with drainage bag with indwelling catheter, foley type, three-way, for continuous irrigation ($34.40–$48.37)
- A4320 — Irrigation tray with bulb or piston syringe, any purpose ($6.34–$8.42)
Building a device that would bill under a code like this? Caduvo matches a device description to HCPCS/CPT codes, Medicare coverage and payment, and the FDA pathway in one report.
Next steps
- Run a reimbursement report for a device billed under A4398
- Watch A4398 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for A4398
Sources: CMS HCPCS Level II release October 2025; CMS DMEPOS fee schedule 2026; CMS NCCI MUE tables; CMS Medicare utilization (physician and DME supplier files); CMS Medicare Coverage Database articles. Fees are Medicare allowables, not commercial rates. Not billing or legal advice.