Marjan Lyons, M.D.
NPI 1548603517 · Internal Medicine Physician · Thousand Oaks, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marjan Lyons, M.D. is a Internal Medicine Physician provider in Thousand Oaks, CA (NPI 1548603517).
Provider details
- NPI number
- 1548603517
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- 141569 (CA)
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
13 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
898 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 | 378 | $115 |
| 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 | 234 | $17 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 124 | $85 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 32 | $157 |
| Administration of Influenza Virus VaccineG0008 | 27 | $35 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 42 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 113 | 39 |
| Amlodipine Besylate | 106 | 40 |
| Levothyroxine Sodium | 97 | 31 |
| Rosuvastatin Calcium | 71 | 25 |
| Zolpidem Tartrate | 59 | 15 |
| Levothyroxine Sodiumbrand: Synthroid | 58 | 15 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-04-09
- Last updated
- 2019-04-17
Frequently asked questions
- What is Marjan Lyons's NPI number?
- Marjan Lyons's National Provider Identifier (NPI) is 1548603517, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marjan Lyons's specialty?
- Marjan Lyons is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marjan Lyons located?
- Marjan Lyons's practice location on file with NPPES is 100 Moody Ct Ste 200, Thousand Oaks, CA 91360-6082.
- What is Marjan Lyons's phone number?
- The practice phone number listed in the NPPES registry for Marjan Lyons is (805) 418-3500.
- Does Marjan Lyons accept Medicare?
- Marjan Lyons is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marjan Lyons's NPI active?
- Yes — Marjan Lyons's NPI (1548603517) is active in the NPPES registry as of the last update on 2019-04-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.