Diane Flershem, M.D.
NPI 1447205869 · Internal Medicine Physician · Arlington Heights, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diane Flershem, M.D. is a Internal Medicine Physician provider in Arlington Heights, IL (NPI 1447205869).
Provider details
- NPI number
- 1447205869
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 036095157 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
4,407 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 1,160 | $131 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 407 | $134 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 406 | $15 |
| Hemoglobin A1c Level83036 | 391 | $9 |
| Annual Alcohol Misuse Screening, 5 to 15 MinutesG0442 | 322 | $19 |
| Annual, Face-To-Face Intensive Behavioral Therapy for Cardiovascular Disease, Individual, 15 MinutesG0446 | 322 | $26 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 99 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 715 | 187 |
| Rosuvastatin Calcium | 681 | 169 |
| Amlodipine Besylate | 482 | 124 |
| Levothyroxine Sodium | 447 | 114 |
| Omeprazole | 334 | 96 |
| Losartan Potassium | 271 | 73 |
| Ezetimibe |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$6,758 across 92 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-24
- Last updated
- 2011-02-25
Frequently asked questions
- What is Diane Flershem's NPI number?
- Diane Flershem's National Provider Identifier (NPI) is 1447205869, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diane Flershem's specialty?
- Diane Flershem is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Diane Flershem located?
- Diane Flershem's practice location on file with NPPES is 3405 N Arlington Heights Rd, Arlington Heights, IL 60004-1536.
- What is Diane Flershem's phone number?
- The practice phone number listed in the NPPES registry for Diane Flershem is (847) 577-9300.
- Does Diane Flershem accept Medicare?
- Diane Flershem is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diane Flershem's NPI active?
- Yes — Diane Flershem's NPI (1447205869) is active in the NPPES registry as of the last update on 2011-02-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.