David Allen Chappell, M.D.
Endocrinology, Diabetes & Metabolism Physician · Petaluma, CA
David Allen Chappell, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Petaluma, California, and NPI 1598732463, issued on Mar 1, 2006. Check the license (California C40326, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- David Allen Chappell
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- C40326 CA
Self-reported in NPPES; status is on the state search - Practice location
- 141 Lynch Creek Way, Petaluma, CA 94954
- Phone
- (707) 762-0001
- Enumerated
- Mar 1, 2006
- Record last updated
- Jul 16, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (707) 765-0666
- Medicare enrollment
- Enrolled (PECOS I20040916001367); accepts Medicare assignment
- Medical or professional school
- University Of Texas Southwestern Medical School At Dallas, 1979
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 1,131 in California → Look up another NPI →
Also registered at 141 Lynch Creek Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sherin Chakkalakel, DNP, FNP-CPrimary Care Nurse Practitioner1104390053
- Thomas Knecht, MD, PHDEndocrinology, Diabetes & Metabolism Physician1235371857
- Cynthia Rathkey, FNPFamily Nurse Practitioner1952474801
Verify David Allen Chappell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C40326Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
48% more Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
3,900 Medicare Part D claims for 232 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims. 86 claims were for opioids.
Most prescribed
- Mounjaro216 claims
- Potassium Chloride215 claims
- Levothyroxine Sodium214 claims
- Atorvastatin Calcium125 claims
- Rosuvastatin Calcium95 claims
- Jardiance89 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.
Industry payments in 2024: $1,790.54
74 payments; by number, the most common kind was food and beverage; the largest payer was Lilly USA, LLC. The 5,661 providers of this specialty with any payment received $5,742.15 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.
David Allen Chappell among 1,131 endocrinology, diabetes & metabolism physician records in California
David Allen Chappell, M.D. is one of 1,131 endocrinology, diabetes & metabolism physician records with a practice address in California. 84% 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, 54% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1979 · median 2003 among the 779 with a school on file
- Record last updated2010 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in California
There are 1,131 endocrinology, diabetes & metabolism physician records in California.
All 1,131 in California → Every provider in Petaluma → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Thomas Knecht, MD, PHDPetaluma, CA 949541235371857
- Jessie Churchill, RNNovato, CA 949491861141657
- Richard Bernstein, MDGreenbrae, CA 949041780750406
- Linda Gaudiani, MDGreenbrae, CA 949041730241589
- Nilma Malik, MDGreenbrae, CA 949041417340704
- Marisela Noorhasan, M.D.Greenbrae, CA 949041174593206
- Pragathi Saligram, MDGreenbrae, CA 949041275712499
- Sharleen Sidhu, M.DGreenbrae, CA 949041962747758
Common questions
What is David Allen Chappell, M.D.'s NPI number?
David Allen Chappell, M.D.'s National Provider Identifier (NPI) is 1598732463, issued on Mar 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is David Allen Chappell, M.D. located?
The NPPES record lists a practice address at 141 Lynch Creek Way, Petaluma, CA, 94954. Phone: (707) 762-0001. Providers update this record themselves, so call before visiting.
How can I verify David Allen Chappell, M.D.'s license?
NPPES lists California license number C40326, 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 David Allen Chappell, M.D. prescribe under Medicare Part D?
In 2024, David Allen Chappell, M.D. had 3,900 Medicare Part D claims for 232 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.