Is CPT 85025 covered by Medicare?

Yes, CPT code 85025 (a complete blood count with automated differential) is covered by Medicare when it is medically necessary.

Coverage Rules

• Medical Necessity Required: Medicare covers CPT 85025 to diagnose or treat symptoms, injuries, or diseases (such as anemia, infections, or bleeding disorders).
• No Routine Screening: Medicare does not cover the test if it is done as a routine or screening physical without a specific signs, symptoms, or diagnosis.
• Documentation: The ordering doctor must write down a clear reason for the test and provide a matching diagnosis (ICD-10) code that Medicare accepts. If a differential white blood cell count is not explicitly needed by the doctor, Medicare may adjust payment to a lower-complexity code without a differential.

CPT code 85025 (Complete Blood Count with automated differential) does not always require a modifier, but certain clinical or operational situations make specific modifiers mandatory.

Common Modifiers for CPT 85025

• Modifier 91: Use this for a repeat lab test on the same day when a second medically necessary result is required to manage the patient (not for equipment failure or reruns).
• Modifier 90: Use this when your practice is billing on behalf of an outside Reference Laboratory that performed the analysis.
• Modifier 26 / TC: Use Modifier 26 if an independent pathologist bills only for the professional interpretation and report, or Modifier TC for the technical component.
• Modifier 59: Use this to indicate a distinct procedural service when NCCI edits bundle 85025 with another separate service.

(Note: While some basic lab tests use Modifier QW for CLIA-waived settings, CPT 85025 is a moderate-complexity test and generally does not qualify for or require Modifier QW).

Original Medicare Original Medicare Not Covered and Medicare Advantage plans have strict rules regarding items and services that are excluded from coverage.

Expiring & Restrictive Coverage Changes

• Broad Telehealth Flexibilities: Pandemic-era telehealth waivers expired on January 31, 2026 Medicare telehealth flexibilities expire. Beneficiaries generally must be located in a medical facility and in a rural area to receive covered telehealth services, except for behavioral health care Medicare Will No Longer Cover This Popular Service Starting Jan. 31.
• Medicare Advantage Non-Qualifying Supplemental Items: CMS rules restrict Medicare Advantage plans from covering non-health items previously allowed for chronically ill enrollees, including alcohol, cannabis, tobacco, unhealthy foods, cosmetic procedures (facelifts), funeral costs, and life or hospital indemnity insurance Medicare Advantage Can No Longer Cover These Items in 2026.

Standard Exclusions in Original Medicare

• Routine Dental Care: Cleanings, fillings, tooth extractions, and dentures What Medicare will not cover in 2026 | The American Legion.
• Routine Vision Care: Eye exams for prescription glasses, contact lenses, or eyeglasses (except following cataract surgery) What Medicare will not cover in 2026 | The American Legion.
• Hearing Care: Routine hearing exams and hearing aids What Medicare will not cover in 2026 | The American Legion.
• Long-Term Custodial Care: Extended nursing home care or assisted living that only involves personal help with daily living activities What Does Medicare Not Cover? Eight Things You Should Know.
• Routine Foot Care: Cutting corns or calluses and basic toenail clipping What Medicare will not cover in 2026 | The American Legion.
• Overseas Care: Medical treatment received outside the United States What Medicare will not cover in 2026 | The American Legion, with rare exceptions.

The single biggest and most costly mistake people make with Medicare is missing enrollment deadlines, leading to permanent late-enrollment penalties and gaps in coverage.

Missing Enrollment Deadlines

• Initial Enrollment Period (IEP): This window lasts for seven months. It starts three months before the month you turn 65, includes your birthday month, and ends three months after.
• Late Penalties: Failing to sign up for Part B or Part D on time can trigger permanent monthly or yearly financial penalties added to your premiums.
• Delayed Enrollment Confusion: Many people wrongly assume they can delay Medicare past age 65 just because they have health coverage like COBRA, a marketplace plan, or small-employer insurance.

Other Costly Medicare Mistakes

• Ignoring Annual Changes: Sticking with automatic renewal without reading the Annual Notice of Change (ANOC) can result in unexpected costs, as drug lists and doctor networks shift every year.
• Choosing Solely by Low Premiums: Picking a plan based only on a low monthly cost while ignoring total out-of-pocket expenses like deductibles, copays, and coinsurance.
• Missing the Medigap Window: Forgetting to apply for a Medigap (Medicare Supplement) policy during your open enrollment window. After this six-month period, insurers can use medical underwriting to charge more or deny coverage.
• Skipping Financial Assistance: Overlooking programs like Medicare Savings Programs or Part D Extra Help that assist with out-of-pocket medical and prescription expenses.

Original Medicare does not cover several common services, including routine dental care, routine vision care, hearing aids, outpatient prescription drugs, and long-term custodial care.

Common Uncovered Services

• Most dental care: Routine checkups, cleanings, fillings, root canals, extractions, and dentures are excluded.
• Routine vision care: Eye exams for prescription glasses, eyeglasses, and contact lenses are not covered (except after cataract surgery).
• Hearing aids: Original Medicare does not pay for hearing exams to fit hearing aids or the devices themselves.
• Outpatient prescription drugs: Standard Parts A and B do not pay for retail prescription medications, requiring a separate Part D policy.
• Long-term care: Custodial nursing home care or assisted living (help with daily personal needs like bathing and dressing) is not covered.