Joannie Mae Cathey Cook, MD
Internal Medicine Physician · Los Angeles, CA
Joannie Mae Cathey Cook, MD is an internal medicine physician with a practice address in Los Angeles, California, and NPI 1780737981, issued on Jan 19, 2007. Check the license (California A33575, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joannie Mae Cathey Cook
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A33575 CA
Self-reported in NPPES; status is on the state search - Practice location
- 231 W Vernon Ave, Los Angeles, CA 90037
- Phone
- (310) 724-7448
- Enumerated
- Jan 19, 2007
- Record last updated
- Dec 4, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (323) 232-6784
- Medicaid ID
- A3357350 CA
- Medicare enrollment
- Enrolled (PECOS I20100107000573); accepts Medicare assignment
- Medical or professional school
- Rush Medical College Of Rush University, 1976
- Entity
- Type 1 · individual
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Verify Joannie Mae Cathey Cook in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A33575Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average internal medicine physician in 2024
289 Medicare Part D claims for 11 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 41 claims were for opioids.
Most prescribed
- Benazepril Hcl31 claims
- Acetaminophen-Codeine29 claims
- Omeprazole25 claims
- Albuterol Sulfate Hfa23 claims
- Naproxen19 claims
- Pravastatin Sodium17 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.
Joannie Mae Cathey Cook among 17,696 internal medicine physician records in California
Joannie Mae Cathey Cook, MD 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1976 · 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 →
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- Damon Forbes, M.D.Los Angeles, CA 900361932335452
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Common questions
What is Joannie Mae Cathey Cook, MD's NPI number?
Joannie Mae Cathey Cook, MD's National Provider Identifier (NPI) is 1780737981, issued on Jan 19, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Joannie Mae Cathey Cook, MD located?
The NPPES record lists a practice address at 231 W Vernon Ave, Los Angeles, CA, 90037. Phone: (310) 724-7448. Providers update this record themselves, so call before visiting.
How can I verify Joannie Mae Cathey Cook, MD's license?
NPPES lists California license number A33575, 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 Joannie Mae Cathey Cook, MD prescribe under Medicare Part D?
In 2024, Joannie Mae Cathey Cook, MD had 289 Medicare Part D claims for 11 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.