A4331 HCPCS code: Extension drainage tubing, any type, any length, with connector/adaptor, for use with urinary leg bag or urostomy pouch, each
A4331 is the HCPCS Level II code for extension drainage tubing, any type, any length, with connector/adaptor, for use with urinary leg bag or urostomy pouch, each. The 2026 Medicare DMEPOS fee schedule pays $4.53 to $5.47 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 6 per day on DME suppliers. Medicare volume rose 59% from 2022 to 2024 (37 to 59 services). In 2024, about 11 clinicians billed Medicare for A4331 for 28 beneficiaries. Its average fee ranks 16 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 | 2001-01-01 |
| Last action effective | 2003-01-01 |
2026 Medicare DMEPOS fee schedule for A4331
| Modifier | Meaning | Lowest state fee | Highest state fee | Ceiling | Floor |
|---|---|---|---|---|---|
| — | base fee | $4.53 | $5.47 | $4.53 | $3.85 |
| State | Modifier | Fee | Rural fee |
|---|---|---|---|
| AK | — | $4.56 | — |
| AL | — | $4.53 | — |
| AR | — | $4.53 | — |
| AZ | — | $4.53 | — |
| CA | — | $4.53 | — |
| CO | — | $4.53 | — |
| CT | — | $4.53 | — |
| DC | — | $4.53 | — |
| DE | — | $4.53 | — |
| FL | — | $4.53 | — |
| GA | — | $4.53 | — |
| HI | — | $4.95 | — |
| IA | — | $4.53 | — |
| ID | — | $4.53 | — |
| IL | — | $4.53 | — |
| IN | — | $4.53 | — |
| KS | — | $4.53 | — |
| KY | — | $4.53 | — |
| LA | — | $4.53 | — |
| MA | — | $4.53 | — |
| MD | — | $4.53 | — |
| ME | — | $4.53 | — |
| MI | — | $4.53 | — |
| MN | — | $4.53 | — |
| MO | — | $4.53 | — |
| MS | — | $4.53 | — |
| MT | — | $4.53 | — |
| NC | — | $4.53 | — |
| ND | — | $4.53 | — |
| NE | — | $4.53 | — |
| NH | — | $4.53 | — |
| NJ | — | $4.53 | — |
| NM | — | $4.53 | — |
| NV | — | $4.53 | — |
| NY | — | $4.53 | — |
| OH | — | $4.53 | — |
| OK | — | $4.53 | — |
| OR | — | $4.53 | — |
| PA | — | $4.53 | — |
| PR | — | $5.47 | — |
| RI | — | $4.53 | — |
| SC | — | $4.53 | — |
| SD | — | $4.53 | — |
| TN | — | $4.53 | — |
| TX | — | $4.53 | — |
| UT | — | $4.53 | — |
| VA | — | $4.53 | — |
| VI | — | $4.53 | — |
| VT | — | $4.53 | — |
| WA | — | $4.53 | — |
| WI | — | $4.53 | — |
| WV | — | $4.53 | — |
| WY | — | $4.53 | — |
How the A4331 fee compares
| Measure | Value |
|---|---|
| Rank among 68 A43 codes (lowest = 1) | 16 |
| Family fee range (average of state fees) | $0.05–$878.06 |
| Rural fee uplift | — |
Who bills A4331 (2024)
| Measure | Value |
|---|---|
| Clinicians billing (by place of service) | 11 |
| Medicare beneficiaries | 28 |
| States with claims | 1 |
Counts only. Supplier and clinician names, contact lists and state-by-state detail are in Caduvo.
Medicare utilization for A4331, 2022–2024
| Year | Services | Beneficiaries | Avg. allowed | Avg. paid |
|---|---|---|---|---|
| 2022 | 37 | 20 | $3.75 | $2.91 |
| 2023 | 44 | 24 | $4.16 | $3.23 |
| 2024 | 59 | 28 | $4.27 | $3.28 |
States with the most A4331 services (2024)
| State | Services | Avg. paid |
|---|---|---|
| Washington | 45 | $3.25 |
NCCI unit limits (MUE)
| Claim type | Max units per day | Rationale |
|---|---|---|
| DME suppliers | 6 | Clinical: Data |
| outpatient hospital claims | 3 | Clinical: Data |
| practitioner claims | 1 | Clinical: Data |
What changed for A4331
- 2026-01-01: Average state fee rose 2.0%: $4.47 to $4.56
- 2001-01-01: A4331 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 A4331?
A4331 is the HCPCS Level II code for extension drainage tubing, any type, any length, with connector/adaptor, for use with urinary leg bag or urostomy pouch, each. Short descriptor: "Extension drainage tubing".
How much does Medicare pay for A4331?
Under the 2026 DMEPOS fee schedule, non-rural state fees are base (base fee): $4.53–$5.47. Rural fees can be higher.
Does Medicare cover A4331?
Coverage code D — Special coverage instructions apply. Medicare covers it when its national or local coverage criteria are met.
Did the Medicare fee for A4331 change in 2026?
The average non-rural state fee moved from $4.47 in 2025 to $4.56 in 2026 (+2.0%). CMS's next quarterly HCPCS and DMEPOS update takes effect January 1, 2027.
How many units of A4331 can be billed per day?
6 on DME suppliers; 3 on outpatient hospital claims; 1 on practitioner 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 A4331
- Watch A4331 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for A4331
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.