Erin Atkinson Cook, M.D.
Internal Medicine Physician · Los Angeles, CA
Erin Atkinson Cook, M.D. is an internal medicine physician with a practice address in Los Angeles, California, and NPI 1558504381, issued on Apr 9, 2009. Check the license (California A116372, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Erin Atkinson Cook
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A116372 CA
Self-reported in NPPES; status is on the state search - Practice location
- 200 Ucla Medical Plz, Los Angeles, CA 90095
- Phone
- (310) 206-8272
- Enumerated
- Apr 9, 2009
- Record last updated
- Aug 5, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (310) 206-3551
- Medicaid ID
- 1558504381 CA
- Medicare enrollment
- Enrolled (PECOS I20120605000599); 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 200 Ucla Medical Plz
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Erin Atkinson Cook in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A116372Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
59% more Medicare Part D claims than the average internal medicine physician in 2024
5,064 Medicare Part D claims for 401 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 101 claims were for opioids.
Most prescribed
- Atorvastatin Calcium395 claims
- Levothyroxine Sodium256 claims
- Amlodipine Besylate241 claims
- Alendronate Sodium167 claims
- Losartan Potassium154 claims
- Donepezil Hcl123 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
- The Regents OF The University OF CaliforniaLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Erin Atkinson Cook among 17,696 internal medicine physician records in California
Erin Atkinson Cook, 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 2009, is newer than 60% of them.
- NPI issued2009 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2009 · median 2004 among the 11,065 with a school on file
- Record last updated2014 · 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).
1,423 internal medicine physician records list a practice address in Los Angeles
They are 1,423 of the 69,537 NPPES records with a practice address in Los Angeles, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Los Angeles → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Benjamin Ansell, MDLos Angeles, CA 900951770516882
- Arnold Brickman, MDLos Angeles, CA 900951447284906
- Arleen Brown, MDLos Angeles, CA 900951720013618
- Richard Buyalos, MDLos Angeles, CA 900951720012123
- Basit Chaudhry, MDLos Angeles, CA 900951992739460
Common questions
What is Erin Atkinson Cook, M.D.'s NPI number?
Erin Atkinson Cook, M.D.'s National Provider Identifier (NPI) is 1558504381, issued on Apr 9, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Erin Atkinson Cook, M.D. located?
The NPPES record lists a practice address at 200 Ucla Medical Plz, Los Angeles, CA, 90095. Phone: (310) 206-8272. Providers update this record themselves, so call before visiting.
How can I verify Erin Atkinson Cook, M.D.'s license?
NPPES lists California license number A116372, 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 Erin Atkinson Cook, M.D. prescribe under Medicare Part D?
In 2024, Erin Atkinson Cook, M.D. had 5,064 Medicare Part D claims for 401 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.