Certificate of Medical Necessity — pulse oximeter (home use)
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This document is a Certificate of Medical Necessity form governing documentation and physician attestation required for coverage of a pulse oximeter (home use) and affects suppliers, ordering physicians, and members seeking DME coverage through the payer.
No material clinical or coverage changes in this revision.
Coverage Criteria
Form completion and reassessment criteria
Covered when ALL of the following are met
physician signature required
supplier and patient demographic fields must be completed (Section 1B)
entered in Section 1B
applies to rented equipment
Coverage of a home pulse oximeter is contingent on completion of the Certificate of Medical Necessity and supporting clinical information. The form must include supplier and patient demographics, an estimated length of need (1 - 99 months; 99 = Lifetime), and documentation of prognosis and whether the condition is chronic or acute. The ordering clinician must also provide relevant diagnosis codes (ICD-10) on the form.
The physician must complete Section 3 attesting that the medical necessity information is accurate and sign and date the form; signature and date stamps are not acceptable. Section 3 also requires an explanation of how treatment will be changed based on oximeter values and any additional circumstances necessitating use. Diagnosis codes (ICD-10) are requested in Section 2 and should be entered on the form.
Coding
| ICD-10 | Diagnosis codes - form requests ICD-10 codes (entered by provider) |
Provider Actions and Responsibilities
Physician completion, attestation, signature, and reassessment requirement
Physician must complete Section 3 (Physician Attestation and Signature) of the Certificate of Medical Necessity, including a statement of how treatment will be changed based on pulse oximeter values, sign and date the form (signature and date stamps are not acceptable), and attest that the medical necessity information is true, accurate, and complete. If the device is rented, the physician must reassess home use every 30 days and document that care is being modified based on the oximeter.
- Complete Section 3 attesting to accuracy of medical necessity information
- Provide a written explanation of how treatment will change based on oximeter values
- Physician signature and date required (signature stamps not acceptable)
- For rentals, physician reassessment and documentation every 30 days that care is modified based on oximeter use
Provider must fully complete attestation and clinical rationale (high importance)
Ensure the physician fully completes and signs the attestation, provides the clinical rationale for home oximetry, documents anticipated length of need, and records how readings will alter management; missing or incomplete physician responses or signature can interrupt authorization and delay coverage.
- Physician must state clinical rationale and how readings will change treatment
- Estimated length of need must be entered (1–99 months; 99 = Lifetime)
- Complete diagnosis codes (ICD-10) as requested on the form
Required form fields and clinical information
Complete all required form fields: supplier and patient demographic information; estimated length of need (enter 1–99 months, where 99 = Lifetime); diagnosis codes (ICD-10); brief prognosis; whether condition is chronic or acute; and complicating factors that substantiate medical necessity.
- Supplier and patient names, contact, and identification fields in Section 1B
- Estimated length of need (number of months) — 1–99 (99 = Lifetime)
- Diagnosis codes (ICD-10) entered in Section 2
- Brief prognosis, chronic vs. acute status, and complicating factors
Documentation/attestation risk — missing signature, attestation, or reassessment may trigger denial
Absence of physician attestation, missing or unsigned signature (including use of signature stamps), failure to document how oximeter use will modify patient care, or lack of required reassessment for rented devices may result in denial of coverage.
- Signature and date stamps are not acceptable — physician must personally sign
- If rented, reassessment every 30 days must show care is being modified based on oximeter use
Medical Necessity Documentation
DME medical necessity documentation
Medical necessity supported when the clinician documents:
entered in Section 1B
physician must describe how readings will alter management in Section 3
Rental and Purchase Rules
| Equipment | Rental rule |
|---|---|
| Pulse oximeter | If rented, the physician must reassess home use every 30 days and document that the patient’s care is being modified based on oximeter use. |
Definitions
Documentation Requirements
Complete form, document impact on care, and perform monthly reassessment for rentals
Complete the Certificate of Medical Necessity with all supplier/patient fields and obtain the physician’s handwritten signature and date. Document specifically how oximeter readings will change treatment decisions; if the device is rented, document a physician reassessment every 30 days indicating care is being modified based on oximeter use.
- Section 1B: complete supplier and patient demographic information and estimated length of need (1–99 months).
- Section 3: physician must explain how treatment will be changed based on pulse oximeter values and provide signature and date (no stamps).
- If rented, physician must reassess home use every 30 days and document that care is modified based on oximeter readings.
Replacement
Background
Pulse oximeters measure peripheral oxygen saturation and are used to monitor patients with chronic or acute cardiopulmonary conditions in the home. The Certificate requests a brief prognosis, whether the condition is chronic or acute, and complicating factors to substantiate medical necessity for home monitoring. Use of the pulse oximeter should be documented to show how readings will alter management.
Not Covered
The policy does not list specific items or circumstances that are categorically excluded from coverage; rather, it emphasizes documentation requirements. The form states that home use should be reassessed every 30 days if the device is rented and that the physician’s assessment must indicate that care is being modified based on oximeter use.
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