CurrentnorthwoodPolicy N/A

Aerochamber: Drug Delivery Systems for Metered Dose Inhaler (MDI)

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Defines coverage, limitations, and documentation requirements for drug delivery systems (spacers/holding chambers/reservoir bags) used with metered dose inhalers for Northwood members; distinguishes Medicare and non‑Medicare handling and applies to DMEPOS benefit determinations.

Policy Summary

Payernorthwood

PolicyAerochamber: Drug Delivery Systems for Metered Dose Inhaler (MDI)

Policy CodePolicy N/A

Change TypeNo material change

Effective DateN/A

Next Review DateN/A

Key ActionMust be ordered by the member's treating practitioner and provider must submit documentation of MDI medication with the claim.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

1/momaximum reservoir allowed

1/yrmaximum holding chamber

A4627,S8100,S8101HCPCS codes listed

NoncoveredMedicare status

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CurrentnorthwoodPolicy N/A

Aerochamber: Drug Delivery Systems for Metered Dose Inhaler (MDI)

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Policy Summary

Payernorthwood

PolicyAerochamber: Drug Delivery Systems for Metered Dose Inhaler (MDI)

Policy CodePolicy N/A

Change TypeNo material change

Effective DateN/A

Next Review DateN/A

Key ActionMust be ordered by the member's treating practitioner and provider must submit documentation of MDI medication with the claim.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

1/momaximum reservoir allowed

1/yrmaximum holding chamber

A4627,S8100,S8101HCPCS codes listed

NoncoveredMedicare status

Provider documentation

AnnualReview frequency

Coverage Criteria

Coverage for Non‑Medicare Members

Covered when ALL of the following are met

Ordering: Must be ordered by the member's treating practitioner.

from Coverage Criteria

Indication (non-Medicare members): Used to enable a member to breathe or inhale a fixed dose of medication from an MDI (considered reasonable and necessary).

policy statement for non‑Medicare members

Medicare Coverage Exclusion

Not covered under Medicare

Medicare exclusion: HCPCS A4627, S8100, and S8101 are noncovered under Medicare.

explicit Medicare noncoverage statement

A drug delivery system for a metered dose inhaler (MDI) is considered reasonable and necessary only when used to enable a member to breathe or inhale a fixed dose of medication from an MDI. Use of an MDI drug delivery system for any other indication is not supported by this policy.

Per the policy history and coverage statements, the following HCPCS codes are noted as noncovered under Medicare: A4627, S8100, and S8101. This Medicare noncoverage status was documented as an update during the 2015 annual review.

The policy specifies that a drug delivery system for an MDI is not reasonable and necessary when used for any purpose other than enabling a member to breathe or inhale a fixed dose of medication from an MDI. Claims for devices used for other indications do not meet medical necessity per this policy.

Coding and Billing

HCPCS Level II Codes and DescriptionHCPCS

A4627	Spacer bag or reservoir, with or without masks, for use with metered dose inhaler.
S8100	Holding chamber or spacer for use with an inhaler or nebulizer; without mask.
S8101	Holding chamber or spacer for use with an inhaler or nebulizer; with mask.

Medicare coding statusmixed

No codes listed

Provider Actions & Documentation Requirements

Prior Authorization

Ordering and documentation required

Device must be ordered by the member's treating practitioner; include documentation of the member's metered‑dose inhaler (MDI) medication with the claim.

Order must come from the treating practitioner.
Supporting documentation showing the MDI medication must be submitted with the claim.

Prior Authorization

Prior authorization not specified

The provided excerpts do not state any prior authorization requirement for Aerochamber/MDI drug delivery systems.

Step Therapy

No step therapy specified

Background

Drug delivery systems for MDIs—commonly referred to as spacers, holding chambers, or reservoir bags—are devices that attach to a metered dose inhaler to create a chamber or reservoir. These devices are intended to facilitate inhalation of a fixed dose of medication from an MDI by allowing the patient to inhale the emitted dose from the chamber rather than directly from the inhaler mouthpiece.

Definitions

Definition — drug delivery system (MDI)

TermDrug delivery system (for MDI)

DefinitionReservoirs or bags used with a metered‑dose inhaler that enable a patient to breathe or inhale a fixed dose of medication.

Typical useEnables delivery of a fixed dose from an MDI when patient coordination is limited.

Related device typesSpacers, holding chambers, reservoir bags (Aerochamber referenced elsewhere).

Definition note — spacer (Aerochamber)

Termspacer (Aerochamber)

Definition note

Policy Summary

Payernorthwood

PolicyAerochamber: Drug Delivery Systems for Metered Dose Inhaler (MDI)

Policy CodePolicy N/A

Change TypeNo material change

Effective DateN/A

Next Review DateN/A

Key ActionMust be ordered by the member's treating practitioner and provider must submit documentation of MDI medication with the claim.

SourceLink

On This Page

No step‑therapy requirements are described in the document excerpts for Aerochamber/MDI delivery systems.

Step Therapy

Step therapy not specified (confirmation)

No step‑therapy language is provided in these policy excerpts; no alternate therapy sequence is required.

Documentation Required

Claim must include MDI documentation

Providers must submit supporting documentation with the claim that documents the metered‑dose inhaler (MDI) medication used with the device.

Attach documentation that shows the member’s MDI medication when billing for the device.

Documentation Required

Retain policy provenance in authorization files

Include relevant change/authorization history (reviewers, approvers, and annual review dates) in authorization files where practical to demonstrate policy provenance.

Change/Authorization History lists preparers/reviewers and approvers for each annual review.
Annual review dates (through 2025) and reviewer/approver names are recorded and can be retained as evidence.

Denial Risk

Medicare noncoverage — A4627, S8100, S8101

HCPCS codes A4627, S8100 and S8101 are noncovered for Medicare members; billing Medicare for these codes risks denial.

Do not bill Medicare for A4627, S8100, or S8101 — these codes are listed as noncovered under Medicare.

Denial Risk

Medicare noncoverage update documented (2015)

Policy history shows the Medicare noncoverage status for Aerochamber/drug delivery system codes was updated in the 2015 annual review; this update should inform Medicare billing decisions.

2015 annual review entry: "Updated policy to reflect codes are noncovered under Medicare."

Referenced in the policy as a drug delivery system for a metered‑dose inhaler; no separate formal definition provided in these excerpts.

Context of mentionListed alongside reservoirs/holding chambers as devices to facilitate inhalation of a fixed MDI dose.

Supporting evidencePolicy references clinical literature on spacers (e.g., Cochrane review) but does not supply a distinct definition in the available chunks.