William G. Lang, M.D.
Internal Medicine Physician · Marina Del Rey, CA
William G. Lang, M.D. is an internal medicine physician with a practice address in Marina Del Rey, California, and NPI 1366455842, issued on Aug 14, 2006. Check the license (California A41887, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William G. Lang
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A41887 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4644 Lincoln Blvd, Marina Del Rey, CA 90292
- Phone
- (310) 536-8200
- Enumerated
- Aug 14, 2006
- Record last updated
- Oct 3, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (310) 536-8240
- Medicare enrollment
- Enrolled (PECOS I20041229000232); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 4644 Lincoln Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jeffrey Colbert, M.D.Orthopaedic Surgery Physician1487656286
- Brian Estwick, MDOphthalmology Physician1003889247
- Cornelia Felber, PA-CPhysician Assistant1912035080
- Michael Gorniowsky, M.D.Family Medicine Physician1073567442
- Jeremy Korman, M.D.Surgery Physician1508870171
- Steven Krems, MDInternal Medicine Physician1972605020
Verify William G. Lang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A41887Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19% more Medicare Part D claims than the average internal medicine physician in 2024
3,775 Medicare Part D claims for 349 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 108 claims were for opioids.
Most prescribed
- Atorvastatin Calcium269 claims
- Levothyroxine Sodium162 claims
- Losartan Potassium156 claims
- Amlodipine Besylate152 claims
- Simvastatin137 claims
- Famotidine113 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Cedars-Sinai Medical Care FoundationBeverly Hills, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William G. Lang among 17,696 internal medicine physician records in California
William G. Lang, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1982 · median 2004 among the 11,065 with a school on file
- Record last updated2013 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
19 internal medicine physician records list a practice address in Marina Del Rey
They are 19 of the 711 NPPES records with a practice address in Marina Del Rey, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Marina Del Rey → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Arti Chawla, M.D.Marina Del Rey, CA 902921548258064
- Angelica Duenas, M.D.Marina Del Rey, CA 902921619982311
- Kambiz Farbakhsh, MDMarina Del Rey, CA 902921861446015
- David Kaplowitz, MDMarina Del Rey, CA 902921073874863
- Steven Krems, MDMarina Del Rey, CA 902921972605020
- Jeffrey Kurland, MDMarina Del Rey, CA 902921013175330
- Carlo Medina, M.D.Marina Del Rey, CA 902921093786444
- Jonathan Rand, MDMarina Del Rey, CA 902921407871106
Common questions
What is William G. Lang, M.D.'s NPI number?
William G. Lang, M.D.'s National Provider Identifier (NPI) is 1366455842, issued on Aug 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William G. Lang, M.D. located?
The NPPES record lists a practice address at 4644 Lincoln Blvd, Marina Del Rey, CA, 90292. Phone: (310) 536-8200. Providers update this record themselves, so call before visiting.
How can I verify William G. Lang, M.D.'s license?
NPPES lists California license number A41887, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William G. Lang, M.D. prescribe under Medicare Part D?
In 2024, William G. Lang, M.D. had 3,775 Medicare Part D claims for 349 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.