William Lang, M.D.
NPI 1366455842 · Internal Medicine Physician · Marina Del Rey, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Lang, M.D. is a Internal Medicine Physician provider in Marina Del Rey, CA (NPI 1366455842).
Provider details
- NPI number
- 1366455842
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A41887 (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
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
590 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 | 184 | $96 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 143 | $9 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 81 | $57 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 62 | $130 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 42 | $68 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 81 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 269 | 85 |
| Levothyroxine Sodium | 162 | 45 |
| Losartan Potassium | 156 | 54 |
| Amlodipine Besylate | 152 | 49 |
| Simvastatin | 137 | 41 |
| Famotidine | 113 | 40 |
| Montelukast Sodium | 94 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-14
- Last updated
- 2013-10-03
Frequently asked questions
- What is William Lang's NPI number?
- William Lang's National Provider Identifier (NPI) is 1366455842, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Lang's specialty?
- William Lang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Lang located?
- William Lang's practice location on file with NPPES is 4644 Lincoln Blvd, Marina Del Rey, CA 90292-6374.
- What is William Lang's phone number?
- The practice phone number listed in the NPPES registry for William Lang is (310) 536-8200.
- Does William Lang accept Medicare?
- William Lang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Lang's NPI active?
- Yes — William Lang's NPI (1366455842) is active in the NPPES registry as of the last update on 2013-10-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.