Stephen Tassler, MD
NPI 1427057181 · Family Medicine Physician · Northbrook, IL
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Tassler, MD is a Family Medicine Physician provider in Northbrook, IL (NPI 1427057181).
Provider details
- NPI number
- 1427057181
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036081166 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
780 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 284 | $70 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 204 | $102 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 166 | $137 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 55 | $8 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 38 | $17 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 82 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 593 | 180 |
| Lisinopril | 257 | 76 |
| Amlodipine Besylate | 237 | 71 |
| Losartan Potassium | 202 | 60 |
| Metformin Hcl | 181 | 55 |
| Levothyroxine Sodium | 179 | 51 |
| Rosuvastatin Calcium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-07-15
- Last updated
- 2020-10-13
- Certified
- 2020-10-13
Frequently asked questions
- What is Stephen Tassler's NPI number?
- Stephen Tassler's National Provider Identifier (NPI) is 1427057181, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Tassler's specialty?
- Stephen Tassler is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Tassler located?
- Stephen Tassler's practice location on file with NPPES is 1885 Shermer Rd, Northbrook, IL 60062-5317.
- What is Stephen Tassler's phone number?
- The practice phone number listed in the NPPES registry for Stephen Tassler is (847) 272-4600.
- Does Stephen Tassler accept Medicare?
- Stephen Tassler is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Tassler's NPI active?
- Yes — Stephen Tassler's NPI (1427057181) is active in the NPPES registry as of the last update on 2020-10-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.