Stephen Lamberton, MD
NPI 1558435123 · Family Medicine Physician · Cudahy, WI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Lamberton, MD is a Family Medicine Physician provider in Cudahy, WI (NPI 1558435123).
Provider details
- NPI number
- 1558435123
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 36983 (WI)
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
19 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
773 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 391 | $118 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 105 | $116 |
| Anticoagulant Management of Patient Taking Warfarin93793 | 50 | $11 |
| Administration of Influenza Virus VaccineG0008 | 44 | $30 |
| Admn Sarscov2 Vacc 1 Dose90480 | 36 | $39 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 32 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 151 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Losartan Potassium | 338 | 81 |
| Levothyroxine Sodium | 330 | 75 |
| Atorvastatin Calcium | 286 | 69 |
| Gabapentin | 284 | 45 |
| Amlodipine Besylate | 248 | 73 |
| Pantoprazole Sodium | 222 | 57 |
| Hydrocodone/Acetaminophen |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-17
- Last updated
- 2023-10-02
- Certified
- 2023-10-02
Frequently asked questions
- What is Stephen Lamberton's NPI number?
- Stephen Lamberton's National Provider Identifier (NPI) is 1558435123, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Lamberton's specialty?
- Stephen Lamberton is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Lamberton located?
- Stephen Lamberton's practice location on file with NPPES is 5900 S. Lake Drive, Cudahy, WI 53110-3171.
- What is Stephen Lamberton's phone number?
- The practice phone number listed in the NPPES registry for Stephen Lamberton is (414) 489-4190.
- Does Stephen Lamberton accept Medicare?
- Stephen Lamberton is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Lamberton's NPI active?
- Yes — Stephen Lamberton's NPI (1558435123) is active in the NPPES registry as of the last update on 2023-10-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.