Steven Lammers, M.D.
NPI 1184600462 · Psychiatry Physician · Vernon Hills, IL
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Steven Lammers, M.D. is a Psychiatry Physician provider in Vernon Hills, IL (NPI 1184600462).
Provider details
- NPI number
- 1184600462
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 036075721 (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
989 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 Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 976 | $58 |
| Psychiatric Diagnostic Evaluation With Medical Services90792 | 13 | $197 |
Typical Medicare-allowed amounts for these services range $58–$197 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 56 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sertraline Hcl | 502 | 101 |
| Duloxetine Hcl | 442 | 81 |
| Trazodone Hcl | 389 | 79 |
| Paroxetine Hcl | 377 | 65 |
| Clonazepam | 339 | 55 |
| Alprazolam | 289 | 54 |
| Escitalopram Oxalate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-12-19
- Last updated
- 2012-02-15
Frequently asked questions
- What is Steven Lammers's NPI number?
- Steven Lammers's National Provider Identifier (NPI) is 1184600462, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Steven Lammers's specialty?
- Steven Lammers is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Steven Lammers located?
- Steven Lammers's practice location on file with NPPES is 977 Lakeview Pkwy, Vernon Hills, IL 60061-1444.
- What is Steven Lammers's phone number?
- The practice phone number listed in the NPPES registry for Steven Lammers is (847) 549-1023.
- Does Steven Lammers accept Medicare?
- Steven Lammers is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Steven Lammers's NPI active?
- Yes — Steven Lammers's NPI (1184600462) is active in the NPPES registry as of the last update on 2012-02-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.