A4418 HCPCS code: Ostomy pouch, closed; without barrier attached, with filter (1 piece), each
A4418 is the HCPCS Level II code for ostomy pouch, closed; without barrier attached, with filter (1 piece), each. The 2026 Medicare DMEPOS fee schedule pays $2.58 to $2.82 depending on the state. Its Medicare coverage code is C (Carrier judgment): Coverage is decided by the Medicare contractor (MAC) case by case. The NCCI unit limit is 2 per day on outpatient hospital claims. Medicare volume fell 4% from 2022 to 2024 (16,050 to 15,330 services). In 2024, 20 suppliers billed Medicare for A4418 (purchases), serving 43 beneficiaries; Arkansas, Michigan, Illinois accounted for 84% of services. Its average fee ranks 9 of 42 A44 codes (family range $0.15–$160.42).
Code details
| Field | Value |
|---|---|
| Section | A codes — Transportation, medical/surgical supplies and miscellaneous |
| Coverage code | C — Carrier judgment |
| Pricing indicator | 37 — DMEPOS: ostomy, tracheostomy and urological supplies |
| BETOS category | D1F — Prosthetic and orthotic devices |
| Added | 2004-01-01 |
| Last action effective | 2004-01-01 |
2026 Medicare DMEPOS fee schedule for A4418
| Modifier | Meaning | Lowest state fee | Highest state fee | Ceiling | Floor |
|---|---|---|---|---|---|
| — | base fee | $2.58 | $2.82 | $2.58 | $2.19 |
| State | Modifier | Fee | Rural fee |
|---|---|---|---|
| AK | — | $2.58 | — |
| AL | — | $2.58 | — |
| AR | — | $2.58 | — |
| AZ | — | $2.58 | — |
| CA | — | $2.58 | — |
| CO | — | $2.58 | — |
| CT | — | $2.58 | — |
| DC | — | $2.58 | — |
| DE | — | $2.58 | — |
| FL | — | $2.58 | — |
| GA | — | $2.58 | — |
| HI | — | $2.58 | — |
| IA | — | $2.58 | — |
| ID | — | $2.58 | — |
| IL | — | $2.58 | — |
| IN | — | $2.58 | — |
| KS | — | $2.58 | — |
| KY | — | $2.58 | — |
| LA | — | $2.58 | — |
| MA | — | $2.58 | — |
| MD | — | $2.58 | — |
| ME | — | $2.58 | — |
| MI | — | $2.58 | — |
| MN | — | $2.58 | — |
| MO | — | $2.58 | — |
| MS | — | $2.58 | — |
| MT | — | $2.58 | — |
| NC | — | $2.58 | — |
| ND | — | $2.58 | — |
| NE | — | $2.58 | — |
| NH | — | $2.58 | — |
| NJ | — | $2.58 | — |
| NM | — | $2.58 | — |
| NV | — | $2.58 | — |
| NY | — | $2.58 | — |
| OH | — | $2.58 | — |
| OK | — | $2.58 | — |
| OR | — | $2.58 | — |
| PA | — | $2.58 | — |
| PR | — | $2.82 | — |
| RI | — | $2.58 | — |
| SC | — | $2.58 | — |
| SD | — | $2.58 | — |
| TN | — | $2.58 | — |
| TX | — | $2.58 | — |
| UT | — | $2.58 | — |
| VA | — | $2.58 | — |
| VI | — | $2.58 | — |
| VT | — | $2.58 | — |
| WA | — | $2.58 | — |
| WI | — | $2.58 | — |
| WV | — | $2.58 | — |
| WY | — | $2.58 | — |
How the A4418 fee compares
| Measure | Value |
|---|---|
| Rank among 42 A44 codes (lowest = 1) | 9 |
| Family fee range (average of state fees) | $0.15–$160.42 |
| Rural fee uplift | — |
Who bills A4418 (2024)
| Measure | Value |
|---|---|
| Suppliers billing rentals | — |
| Suppliers billing purchases | 20 |
| Referring clinicians | 48 |
| Medicare beneficiaries | 43 |
| States with claims | 6 |
| Share of services in top 3 states (Arkansas, Michigan, Illinois) | 84% |
| Year | Suppliers | Beneficiaries |
|---|---|---|
| 2022 | 29 | 54 |
| 2023 | 23 | 43 |
| 2024 | 20 | 43 |
Counts only. Supplier and clinician names, contact lists and state-by-state detail are in Caduvo.
Medicare utilization for A4418, 2022–2024
| Year | Services | Beneficiaries | Avg. allowed | Avg. paid |
|---|---|---|---|---|
| 2022 | 16,050 | 54 | $2.21 | $1.60 |
| 2023 | 13,820 | 43 | $2.37 | $1.75 |
| 2024 | 15,330 | 43 | $2.43 | $1.79 |
States with the most A4418 services (2024)
| State | Services | Avg. paid |
|---|---|---|
| Arkansas | 5,520 | $1.82 |
| Michigan | 4,140 | $1.81 |
| Illinois | 1,260 | $1.80 |
| Iowa | 720 | $1.58 |
| Oklahoma | 720 | $1.86 |
NCCI unit limits (MUE)
| Claim type | Max units per day | Rationale |
|---|---|---|
| outpatient hospital claims | 2 | Clinical: CMS Workgroup |
| practitioner 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 A4418
- 2026-01-01: Average state fee rose 2.0%: $2.53 to $2.58
- 2004-01-01: A4418 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 A4418?
A4418 is the HCPCS Level II code for ostomy pouch, closed; without barrier attached, with filter (1 piece), each. Short descriptor: "Ost pch clsd w/o bar w filtr".
How much does Medicare pay for A4418?
Under the 2026 DMEPOS fee schedule, non-rural state fees are base (base fee): $2.58–$2.82. Rural fees can be higher.
Does Medicare cover A4418?
Coverage code C — Carrier judgment. Coverage is decided by the Medicare contractor (MAC) case by case.
Which diagnoses support coverage for A4418?
Medicare policy articles that cite A4418 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 A4418 change in 2026?
The average non-rural state fee moved from $2.53 in 2025 to $2.58 in 2026 (+2.0%). CMS's next quarterly HCPCS and DMEPOS update takes effect January 1, 2027.
How many units of A4418 can be billed per day?
2 on outpatient hospital claims; 2 on practitioner claims (NCCI medically unlikely edits).
Related A44 codes
- A4400 — Ostomy irrigation set ($59.20–$90.97)
- A4402 — Lubricant, per ounce ($1.93–$5.70)
- A4404 — Ostomy ring, each ($2.03–$2.60)
- A4405 — Ostomy skin barrier, non-pectin based, paste, per ounce ($4.87–$5.76)
- A4406 — Ostomy skin barrier, pectin-based, paste, per ounce ($8.16–$9.78)
- A4407 — Ostomy skin barrier, with flange (solid, flexible, or accordion), extended wear, with built-in convexity, 4 x 4 inches or smaller, each ($12.48–$14.94)
- A4408 — Ostomy skin barrier, with flange (solid, flexible or accordion), extended wear, with built-in convexity, larger than 4 x 4 inches, each ($14.07–$16.87)
- A4409 — Ostomy skin barrier, with flange (solid, flexible or accordion), extended wear, without built-in convexity, 4 x 4 inches or smaller, each ($8.84–$10.60)
- A4410 — Ostomy skin barrier, with flange (solid, flexible or accordion), extended wear, without built-in convexity, larger than 4 x 4 inches, each ($12.88–$15.43)
- A4411 — Ostomy skin barrier, solid 4 x 4 or equivalent, extended wear, with built-in convexity, each ($7.26–$8.70)
- A4412 — Ostomy pouch, drainable, high output, for use on a barrier with flange (2 piece system), without filter, each ($3.86–$4.56)
- A4413 — Ostomy pouch, drainable, high output, for use on a barrier with flange (2 piece system), with filter, each ($7.85–$9.44)
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 A4418
- Watch A4418 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for A4418
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.