Joann M. Timberlake, PA
Emergency Medicine Physician · Orange, CA
Joann M. Timberlake, PA is an emergency medicine physician with a practice address in Orange, California, and NPI 1043241094, issued on Jul 6, 2006. Check the license (California PA18228, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joann M. Timberlake
- Credential
- PA
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- PA18228 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1100 West Stewart Drive, Orange, CA 92868
- Phone
- (714) 633-9111
- Enumerated
- Jul 6, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20060905000587); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 2005
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 1100 West Stewart Drive
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michael Anderson, MDEmergency Medicine Physician1093747750
- Rishi Bhargava, MDEmergency Medicine Physician1407811623
- Jonathan Blair, MDEmergency Medicine Physician1891727954
- Elizabeth Fiedler, MDEmergency Medicine Physician1578594529
- Geoffrey Green, PAMedical Physician Assistant1306878533
- Nicola Lowrey, PAMedical Physician Assistant1760419428
Verify Joann M. Timberlake in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license PA18228Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average emergency medicine physician in 2024
29 Medicare Part D claims for 20 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Tamsulosin Hcl16 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 71.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $49.12
2 payments; by number, the most common kind was food and beverage; the largest payer was Siemens Medical Solutions USA, Inc. The 12,335 providers of this specialty with any payment received $953.79 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Memorial Radiation Oncology MedicalFountain Valley, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joann M. Timberlake among 7,751 emergency medicine physician records in California
Joann M. Timberlake, PA is one of 7,751 emergency medicine physician records with a practice address in California. 81% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2005 · median 2011 among the 4,560 with a school on file
- Record last updated2007 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
179 emergency medicine physician records list a practice address in Orange
They are 179 of the 13,245 NPPES records with a practice address in Orange, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Orange → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Michael Anderson, MDOrange, CA 928681093747750
- Rishi Bhargava, MDOrange, CA 928681407811623
- Jonathan Blair, MDOrange, CA 928681891727954
- Bharath Chakravarthy, MDOrange, CA 928681144259839
- Elizabeth Fiedler, MDOrange, CA 928681578594529
- Jeffrey Hughes, MDOrange, CA 928681871525949
- Michael Menchine, MDOrange, CA 928681912963612
- David Merin, MDOrange, CA 928681811929979
Common questions
What is Joann M. Timberlake, PA's NPI number?
Joann M. Timberlake, PA's National Provider Identifier (NPI) is 1043241094, issued on Jul 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joann M. Timberlake, PA located?
The NPPES record lists a practice address at 1100 West Stewart Drive, Orange, CA, 92868. Phone: (714) 633-9111. Providers update this record themselves, so call before visiting.
How can I verify Joann M. Timberlake, PA's license?
NPPES lists California license number PA18228, 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 Joann M. Timberlake, PA prescribe under Medicare Part D?
In 2024, Joann M. Timberlake, PA had 29 Medicare Part D claims for 20 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Joann M. Timberlake, PA's MIPS final score?
The 2023 MIPS final score is 71.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.