Does SelectHealth Cover Metformin?

What Is Metformin and Why Does Coverage Matter?

Metformin is the most prescribed oral glucose-lowering drug in the United States, with roughly 91 million prescriptions dispensed annually according to IQVIA data cited by the CDC. Because it is inexpensive as a generic and carries a decades-long safety record, most insurers place it on Tier 1 of their formularies. Still, coverage gaps exist for patients whose diagnosis code does not match an FDA-approved indication.

What Metformin Does Clinically

Metformin lowers blood glucose primarily by suppressing hepatic glucose production and improving peripheral insulin sensitivity, without stimulating insulin secretion. The FDA approved it for type 2 diabetes in 1994 [1]. In the landmark UK Prospective Diabetes Study 34 (UKPDS 34, N=753), overweight patients assigned to intensive metformin therapy experienced a 32% reduction in any diabetes-related endpoint and a 36% reduction in all-cause mortality compared with conventional diet therapy (P<0.002) [2]. That evidence base is exactly why payers treat metformin as a foundational generic.

Why Off-Label Use Complicates Coverage

The FDA label covers type 2 diabetes only. Physicians prescribe metformin off-label for prediabetes, polycystic ovary syndrome (PCOS), and increasingly for longevity protocols informed by the TAME (Targeting Aging with Metformin) trial currently enrolling approximately 3,000 participants across 14 U.S. Sites [3]. When the diagnosis code on a prescription is something other than E11.x (type 2 diabetes), SelectHealth and other insurers may reclassify coverage or require additional documentation.

How SelectHealth Structures Its Drug Formulary

SelectHealth is a regional health plan based in Utah, operating under Intermountain Health. Like most U.S. Commercial insurers, it uses a tiered formulary to determine member cost-sharing.

The Five-Tier Structure

SelectHealth commercial plans generally use a five-tier model:

• Tier 1: Preferred generics. Lowest copay, typically $0, $10.
• Tier 2: Non-preferred generics or preferred brand drugs. Usually $20, $45.
• Tier 3: Non-preferred brand drugs. Typically $45, $75.
• Tier 4: Specialty drugs. Often 20 to 33% coinsurance.
• Tier 5: Specialty high-cost drugs. Highest out-of-pocket.

Metformin immediate-release and extended-release (metformin ER / glucophage XR generic) both sit at Tier 1 on most SelectHealth commercial formularies as of 2025. The SelectHealth drug lookup tool and your Evidence of Coverage (EOC) document are the authoritative sources for your specific plan year [4].

Medicare Advantage Formulary Placement

On SelectHealth Medicare Advantage plans, metformin falls under Part D drug coverage. CMS requires Medicare Part D plans to cover metformin on their formularies because it appears on the protected-class list for diabetes drugs. The 2025 Medicare Part D out-of-pocket cap of $2,000 (introduced by the Inflation Reduction Act) means even higher-cost drugs become more affordable, but metformin rarely approaches that threshold [5].

What "Covered" Actually Means for Your Wallet

Coverage does not always equal zero cost. Your actual expense depends on:

1. Whether you have met your annual deductible.
2. Your plan's specific Tier 1 copay amount.
3. Whether your pharmacy is in-network.
4. The days supply requested (30 vs. 90 days).

A 90-day mail-order supply of generic metformin 500 mg or 1000 mg through SelectHealth's preferred pharmacy network often costs $0, $20 even before deductible is met, because Tier 1 generics are frequently exempt from the deductible under the ACA's preventive drug rules for certain plan designs [6].

Does SelectHealth Require Prior Authorization for Metformin?

For type 2 diabetes (ICD-10 code E11.x), SelectHealth does not typically require prior authorization for metformin. The drug's low cost and established safety profile make step therapy or PA requirements unnecessary for this indication.

When Prior Authorization May Apply

Prior authorization becomes relevant in three scenarios:

Scenario 1: Off-label diagnosis codes. If a prescriber submits metformin with a prediabetes diagnosis (R73.03) or PCOS (E28.2), some SelectHealth plan designs flag the claim for review. The American Diabetes Association's 2024 Standards of Care in Diabetes state: "Metformin therapy for prevention of type 2 diabetes should be considered in adults with prediabetes, especially those with BMI >35 kg/m², age <60 years, or prior gestational diabetes" [7]. Citing that guideline in a PA letter substantially strengthens approval odds.

Scenario 2: High-dose or combination requests. Requests for metformin doses above 2,550 mg per day (the FDA maximum labeled dose) may trigger review [1].

Scenario 3: Specific employer-sponsored plan designs. Self-funded employer plans have more latitude to customize formularies. Some SelectHealth ASO (administrative services only) clients restrict certain drug classes. Check your Summary of Benefits and Coverage (SBC).

How to File a Prior Authorization Request

If PA is required, the prescriber submits a PA form through SelectHealth's provider portal or via fax. Supporting documentation should include the clinical diagnosis, relevant lab values (fasting glucose, HbA1c, OGTT results), and applicable guideline citations. SelectHealth is required by Utah state law to respond to standard PA requests within 3 business days and urgent requests within 24 hours [8].

Metformin for Prediabetes: Will SelectHealth Pay?

This is the most common coverage gray zone. The CDC's National Diabetes Prevention Program recognizes metformin as a clinical option for high-risk prediabetes patients who do not respond adequately to lifestyle intervention [9].

The Clinical Evidence Payers Cite

The Diabetes Prevention Program (DPP) trial (N=3,234) found metformin 850 mg twice daily reduced the incidence of type 2 diabetes by 31% compared with placebo over an average 2.8-year follow-up (P<0.001) [10]. Lifestyle intervention reduced incidence by 58%, making it the first-line recommendation, but metformin's 31% reduction is clinically meaningful for patients who cannot sustain lifestyle changes.

SelectHealth may cover metformin for prediabetes when the prescriber documents:

• HbA1c between 5.7% and 6.4%, or fasting glucose 100 to 125 mg/dL.
• A clinical note explaining why lifestyle intervention alone is insufficient.
• Reference to the ADA's 2024 guideline recommendation cited above [7].

The HealthRX clinical team uses the following decision framework when helping patients request coverage for metformin in prediabetes:

1. Lab documentation: Include HbA1c, fasting glucose, and body weight at time of prescription.
2. Lifestyle history: Note duration and outcomes of any prior structured lifestyle program.
3. Guideline anchor: Quote ADA Standards of Care section 3 (Prevention or Delay of Type 2 Diabetes) verbatim in the PA letter.
4. Risk stratification: Highlight any additional risk factors (BMI >35, prior gestational diabetes, age <60) that align with ADA's preferred-use criteria.
5. Appeals readiness: If the initial claim is denied, file a formal appeal within 60 days and request an external independent review if the internal appeal fails.

Metformin for PCOS: Coverage Considerations

PCOS affects 6 to 12% of reproductive-age women in the U.S., according to the CDC [11]. Metformin is frequently prescribed for PCOS to improve insulin sensitivity and restore ovulatory cycles, though the FDA has not approved it for this indication.

Evidence Supporting Use in PCOS

A 2012 Cochrane systematic review of metformin in PCOS (44 trials, N=3,992) found metformin significantly improved ovulation rates (OR 3.88, 95% CI 2.25 to 6.69) and reduced fasting insulin compared with placebo [12]. The Endocrine Society's 2023 PCOS guideline notes that metformin may be used as an adjunct to lifestyle therapy in women with PCOS and metabolic dysfunction [13].

Getting SelectHealth to Pay for PCOS

Submit the claim with ICD-10 E28.2 (polycystic ovarian syndrome). If SelectHealth denies it as off-label, the prescriber's appeal letter should cite the Endocrine Society guideline and the Cochrane meta-analysis. Because metformin costs as little as $4, $10 at discount pharmacies even without insurance, some patients choose to bypass insurance entirely for this indication rather than spend time on appeals.

Metformin for Longevity: Is There Any Coverage?

Prescribing metformin explicitly for longevity or anti-aging purposes is not covered by SelectHealth or any major commercial insurer at this time. There is no approved ICD-10 code for "longevity optimization."

The TAME Trial and What It May Change

The TAME (Targeting Aging with Metformin) trial, funded by the American Federation for Aging Research and supported by the National Institute on Aging, is the first randomized controlled trial designed to test metformin as an intervention against biological aging in non-diabetic adults aged 65 to 79 [3]. Results are expected around 2027. If TAME produces positive data and metformin receives an expanded label or guideline endorsement for aging-related indications, coverage discussions with payers would likely follow within 2 to 5 years.

For now, patients interested in metformin for longevity who do not have diabetes or prediabetes typically pay out-of-pocket. At GoodRx prices, a 90-day supply of metformin 500 mg twice daily costs approximately $9, $18 at major retail pharmacies, making self-pay feasible for most patients [14].

What to Do If SelectHealth Denies Your Metformin Claim

Denials happen. Knowing the appeals process puts you back in control.

Step 1: Understand the Denial Reason

SelectHealth must send a written Explanation of Benefits (EOB) explaining why a claim was denied. Common reasons include:

• Missing or mismatched diagnosis code.
• Formulary exclusion for a specific plan design.
• Quantity limit exceeded.
• Prior authorization not obtained.

Step 2: File an Internal Appeal

You have the right to file an internal appeal within 180 days of receiving the denial notice under the ACA [6]. Submit a written request with supporting clinical documentation. SelectHealth must respond within 30 days for non-urgent matters or 72 hours for urgent requests.

Step 3: Request External Review

If the internal appeal is denied, request an independent external review. An independent organization reviews the decision without SelectHealth's involvement. Nationally, patients who pursue external review win approximately 40% of cases, according to KFF's 2023 analysis of insurance appeals data [15].

Step 4: Use Manufacturer or Pharmacy Discount Programs

While appeals proceed, use GoodRx, Mark Cuban's Cost Plus Drugs (costplusdrugs.com), or the RxSS savings card. Metformin is available at Cost Plus Drugs for approximately $4.20 per 90-day supply of 500 mg tablets as of early 2025. These programs do not require insurance involvement and have no income requirement.

Cost-Saving Programs That Work Alongside SelectHealth Coverage

Even when SelectHealth covers metformin, layering discount programs can reduce costs further in some situations.

GoodRx and Similar Discount Cards

GoodRx prices at major chains often beat insurance copays for Tier 1 generics. Patients can present a GoodRx coupon instead of their SelectHealth card when the cash price is lower. The pharmacist applies whichever pricing the patient presents; you cannot use both simultaneously [14].

340B Drug Pricing Program

Patients receiving care at federally qualified health centers (FQHCs) or other 340B-eligible providers may access metformin at deeply reduced prices through the 340B program, regardless of insurance status. The Health Resources and Services Administration (HRSA) maintains a database of 340B-covered entities [16].

State Pharmaceutical Assistance Programs

Utah does not currently operate a broad state pharmaceutical assistance program for working-age adults, but Medicare-eligible patients may qualify for the Low Income Subsidy (LIS/Extra Help) program, which can reduce Part D costs to $0, $4.50 per prescription for qualifying low-income individuals [5].

Specific SelectHealth Plan Types and How Coverage Differs

SelectHealth Individual and Family Plans (Marketplace / Commercial)

These plans sold on healthcare.gov or directly from SelectHealth follow ACA rules. Metformin for type 2 diabetes is covered at Tier 1. Deductible exemption for preventive generics depends on plan design; HSA-compatible high-deductible health plans (HDHPs) cannot cover most drugs before the deductible without losing HSA eligibility, but the IRS issued guidance in 2019 allowing HDHPs to cover metformin and other chronic disease management drugs pre-deductible [17].

SelectHealth Advantage (Medicare Advantage)

Medicare Advantage enrollees receive Part D drug coverage through SelectHealth. Metformin sits in the "preferred generic" tier on SelectHealth Advantage formularies, with a $0 copay in many plan designs during both the initial coverage and catastrophic phases under the redesigned 2025 Part D benefit [5].

SelectHealth Share (Medicaid)

SelectHealth administers Utah Medicaid managed care for certain populations under the SelectHealth Share plan. Medicaid covers metformin at no cost to enrollees for approved indications. Utah Medicaid's preferred drug list (PDL) places metformin IR and ER in the preferred position without PA for type 2 diabetes [8].

Employer-Sponsored SelectHealth Plans

Coverage varies because self-funded employers set their own formulary rules. Confirm your specific plan's drug list using the SelectHealth member portal or by calling the number on your insurance card before filling a prescription.