HCPCS Level II A4371: Ostomy Skin Barrier Powder, Per Ounce

HCPCS Level II code A4371 describes an ostomy skin barrier powder, billed per ounce for topical use to protect peristomal skin and manage moisture around an ostomy site; service type is topical ostomy supply and typical site of service is home or outpatient setting where ostomy supplies are applied and maintained.

For related coverage guidance, see recent payer policy updates: Salivary Hormone Testing, Bone Turnover Markers Testing, Parathyroid Hormone, Phosphorus, Calcium, and Magnesium Testing.

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HCPCS Level II A4371: Ostomy Skin Barrier Powder, Per Ounce

For related coverage guidance, see recent payer policy updates: Salivary Hormone Testing, Bone Turnover Markers Testing, Parathyroid Hormone, Phosphorus, Calcium, and Magnesium Testing.

Customize your policy alerts

Sign up for hcpcs A4371 policy alerts

Get alerted when payer policies referencing A4371 are released or updated.

Monitor payer policy activity

Receive email alerts as soon as relevant payer policies are published or updated.

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult or pediatric ostomy recipient who requires topical powder to manage peri-stomal skin irritation, leakage-related moisture, or excoriation under an ostomy skin barrier. The clinical workflow begins with a wound- or ostomy-care nurse assessing the stoma and peri‑stomal skin during an outpatient clinic visit, home health visit, or long‑term care nursing assessment. When peri‑stomal skin shows maceration, granulation tissue, or persistent weeping that interferes with appliance adhesion, the clinician documents the skin findings, records the ostomy type (ileostomy, colostomy, urostomy), and selects an ostomy skin barrier powder to absorb moisture and protect the skin prior to applying a new skin barrier or pouching system. The item A4371 (ostomy skin barrier, powder, per oz) is dispensed in appropriate quantity, and documentation includes diagnosis code(s) supporting medical necessity, supplier details, quantity dispensed, and patient education on application and pouching technique. Typical sites of service include outpatient wound/ostomy clinics, home health visits, durable medical equipment suppliers, and skilled nursing facilities.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97597`	Debridement, open wound, selective debridement, without anesthesia; first 20 sq cm or less	Performed when peri‑stomal necrotic tissue requires debridement before barrier application; may precede powder use.
`11042`	Debridement, subcutaneous tissue, first 20 sq cm or less	Used for more invasive tissue removal in peristomal debridement before wound bed preparation and ostomy supplies.
`99406`	Smoking and tobacco use cessation counseling, intermediate, greater than 3 minutes up to 10 minutes	Counseling codes occasionally billed during ostomy education visits; supports holistic care but not directly for powder.
`99401`	Preventive medicine counseling, individual, 15 minutes	Education on ostomy care, pouching technique, and skin protection often occurs in conjunction with supply dispensing.
`99504`	Home visit for care and management of a new patient, other home care services	Home health clinician visits when supplies such as `A4371` are provided and applied in the home setting.

Related Modifiers

5 rows

Modifier	Description	When to Use
22	Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…	- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
52	Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…	- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
53	Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…	- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
59	Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…	- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
62	Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…	- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
163W00000X	Registered Nurse	(1) A registered nurse is a person qualified by graduation from an accredited nursing school (depending upon schooling, a registered nurse may receive…
207Q00000X	Family Medicine Physician	Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadt…
246Q00000X	Pathology Specialist/Technologist	(1) An individual educated and trained in clinical chemistry, microbiology or other biological sciences; and in gathering data on the blood, tissues, …
2255A2300X	Athletic Trainer	Athletic trainers are allied health care professionals who work in consultation with or under the direction of physicians, and specialize in the preve…
2279P3900X	Neonatal/Pediatric Registered Respiratory Therapist	The care and treatment of premature infants, newborns and children. This includes management of mechanical ventilation, assessment, diagnostics and g…
103TW0100X	Deactivated - Psychotherapy Women
207RA0000X	Adolescent Medicine (Internal Medicine) Physician	An internist who specializes in adolescent medicine is a multi-disciplinary healthcare specialist trained in the unique physical, psychological and so…
2080T0004X	Pediatric Transplant Hepatology Physician	A pediatrician with expertise in transplant hepatology encompasses the special knowledge and skill required of pediatric gastroenterologists to care f…

Related Payer Policy Updates

Specialty: Endocrinology1 / 3

10 rows

Policy	Payer	Effective Date
Salivary Hormone Testing	Oscar Health	2026-10-01
Bone Turnover Markers Testing	Oscar Health	2026-10-01
Parathyroid Hormone, Phosphorus, Calcium, and Magnesium Testing	Oscar Health	2026-10-01
Testosterone — Coverage Criteria for Measurement and Monitoring	Oscar Health	2026-10-01
Thyroid Disease Testing	Oscar Health	2026-10-01
Diabetes Mellitus Testing — Coverage Criteria	Oscar Health	2026-10-01
Thyroid Disease Testing	blue cross blue shield - louisiana	2026-09-15
Thyroid Disease Testing	Blue Cross Blue Shield - New Mexico	2026-09-04
Parathyroid Hormone, Phosphorous, Calcium and Magnesium Testing	Blue Cross Blue Shield - New Mexico	2026-09-04
Testosterone laboratory testing and management	Premera Bluecross	2026-09-04

Related Codes

HCPCS-A4206-STERILE-SYRINGE-1CC-NEEDLE

HCPCS A4206: Syringe with Needle, 1 cc or Less, Sterile

HCPCS-A4207-STERILE-2CC-SYRINGE-WITH-NEEDLE

HCPCS Level II A4207: Syringe with Needle, Sterile 2 cc

HCPCS-A4208-STERILE-3CC-SYRINGE-WITH-NEEDLE

HCPCS Level II A4208: Syringe with Needle, Sterile 3 cc

HCPCS-A4209-STERILE-SYRINGE-WITH-NEEDLE-5CC-OR-GREATER

HCPCS Level II A4209: Syringe with Needle, Sterile 5 cc or Greater

HCPCS-A4210-NEEDLE-FREE-INJECTION-DEVICE

HCPCS Level II A4210: Needle-free Injection Device, Each

HCPCS-A4211-SUPPLIES-SELF-ADMINISTERED-INJECTIONS

HCPCS Level II A4211: Supplies for Self-Administered Injections

HCPCS-A4212-NON-CORING-NEEDLE-STYLET-CATHETER-ACCESS-SUPPLY

HCPCS Level II A4212: Non-coring Needle or Stylet with/without Catheter

HCPCS-A4213-STERILE-SYRINGE-20CC-OR-GREATER

HCPCS Level II A4213: Syringe, Sterile, 20 cc or Greater, Each

HCPCS-A4215-STERILE-NEEDLE-SINGLE-EACH

HCPCS Level II A4215: Needle, Sterile, Any Size

HCPCS-A4216-STERILE-DILUENT-FLUSH-10ML

HCPCS Level II A4216: Sterile Diluent/Flush, 10 ml

Showing 1–10 of 633

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

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Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

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Clinical & Coding Specifications

Clinical Context

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97597`	Debridement, open wound, selective debridement, without anesthesia; first 20 sq cm or less	Performed when peri‑stomal necrotic tissue requires debridement before barrier application; may precede powder use.
`11042`	Debridement, subcutaneous tissue, first 20 sq cm or less	Used for more invasive tissue removal in peristomal debridement before wound bed preparation and ostomy supplies.
`99406`	Smoking and tobacco use cessation counseling, intermediate, greater than 3 minutes up to 10 minutes	Counseling codes occasionally billed during ostomy education visits; supports holistic care but not directly for powder.
`99401`	Preventive medicine counseling, individual, 15 minutes	Education on ostomy care, pouching technique, and skin protection often occurs in conjunction with supply dispensing.
`99504`	Home visit for care and management of a new patient, other home care services	Home health clinician visits when supplies such as `A4371` are provided and applied in the home setting.

Related Modifiers

5 rows

Modifier	Description	When to Use
22	Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…	- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
52	Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…	- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
53	Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…	- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
59	Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…	- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
62	Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…	- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
163W00000X	Registered Nurse	(1) A registered nurse is a person qualified by graduation from an accredited nursing school (depending upon schooling, a registered nurse may receive…
207Q00000X	Family Medicine Physician	Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadt…
246Q00000X	Pathology Specialist/Technologist	(1) An individual educated and trained in clinical chemistry, microbiology or other biological sciences; and in gathering data on the blood, tissues, …
2255A2300X	Athletic Trainer	Athletic trainers are allied health care professionals who work in consultation with or under the direction of physicians, and specialize in the preve…
2279P3900X	Neonatal/Pediatric Registered Respiratory Therapist	The care and treatment of premature infants, newborns and children. This includes management of mechanical ventilation, assessment, diagnostics and g…
103TW0100X	Deactivated - Psychotherapy Women
207RA0000X	Adolescent Medicine (Internal Medicine) Physician	An internist who specializes in adolescent medicine is a multi-disciplinary healthcare specialist trained in the unique physical, psychological and so…
2080T0004X	Pediatric Transplant Hepatology Physician	A pediatrician with expertise in transplant hepatology encompasses the special knowledge and skill required of pediatric gastroenterologists to care f…

Related Payer Policy Updates

Specialty: Endocrinology1 / 3

10 rows

Policy	Payer	Effective Date
Salivary Hormone Testing	Oscar Health	2026-10-01
Bone Turnover Markers Testing	Oscar Health	2026-10-01
Parathyroid Hormone, Phosphorus, Calcium, and Magnesium Testing	Oscar Health	2026-10-01
Testosterone — Coverage Criteria for Measurement and Monitoring	Oscar Health	2026-10-01
Thyroid Disease Testing	Oscar Health	2026-10-01
Diabetes Mellitus Testing — Coverage Criteria	Oscar Health	2026-10-01
Thyroid Disease Testing	blue cross blue shield - louisiana	2026-09-15
Thyroid Disease Testing	Blue Cross Blue Shield - New Mexico	2026-09-04
Parathyroid Hormone, Phosphorous, Calcium and Magnesium Testing	Blue Cross Blue Shield - New Mexico	2026-09-04
Testosterone laboratory testing and management	Premera Bluecross	2026-09-04

Related Codes

HCPCS-A4206-STERILE-SYRINGE-1CC-NEEDLE

HCPCS A4206: Syringe with Needle, 1 cc or Less, Sterile

HCPCS-A4207-STERILE-2CC-SYRINGE-WITH-NEEDLE

HCPCS Level II A4207: Syringe with Needle, Sterile 2 cc

HCPCS-A4208-STERILE-3CC-SYRINGE-WITH-NEEDLE

HCPCS Level II A4208: Syringe with Needle, Sterile 3 cc

HCPCS-A4209-STERILE-SYRINGE-WITH-NEEDLE-5CC-OR-GREATER

HCPCS Level II A4209: Syringe with Needle, Sterile 5 cc or Greater

HCPCS-A4210-NEEDLE-FREE-INJECTION-DEVICE

HCPCS Level II A4210: Needle-free Injection Device, Each

HCPCS-A4211-SUPPLIES-SELF-ADMINISTERED-INJECTIONS

HCPCS Level II A4211: Supplies for Self-Administered Injections

HCPCS-A4212-NON-CORING-NEEDLE-STYLET-CATHETER-ACCESS-SUPPLY

HCPCS Level II A4212: Non-coring Needle or Stylet with/without Catheter

HCPCS-A4213-STERILE-SYRINGE-20CC-OR-GREATER

HCPCS Level II A4213: Syringe, Sterile, 20 cc or Greater, Each

HCPCS-A4215-STERILE-NEEDLE-SINGLE-EACH

HCPCS Level II A4215: Needle, Sterile, Any Size

HCPCS-A4216-STERILE-DILUENT-FLUSH-10ML

HCPCS Level II A4216: Sterile Diluent/Flush, 10 ml

Showing 1–10 of 633

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

HCPCS Level II A4371: Ostomy Skin Barrier Powder, Per Ounce

Sign up for hcpcs A4371 policy alerts

HCPCS Level II A4371: Ostomy Skin Barrier Powder, Per Ounce

Sign up for hcpcs A4371 policy alerts

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related Payer Policy Updates

Related Codes

What does HCPCS code A4371 represent and where is it typically used?

What clinical and documentation elements should accompany billing for A4371?

Which modifiers are relevant when billing A4371 and when should they be considered?

How do the related CPT codes (like 97597 or 11042) relate to billing A4371?

Which payers cover A4371 and how should payer policies influence billing?

References

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related Payer Policy Updates

Related Codes

What does HCPCS code A4371 represent and where is it typically used?

What clinical and documentation elements should accompany billing for A4371?

Which modifiers are relevant when billing A4371 and when should they be considered?

How do the related CPT codes (like 97597 or 11042) relate to billing A4371?

Which payers cover A4371 and how should payer policies influence billing?

References