Natalie Y. Chang, D.O.
Internal Medicine Physician · Walnut Creek, CA
Natalie Y. Chang, D.O. is an internal medicine physician with a practice address in Walnut Creek, California, and NPI 1205018561, issued on Nov 28, 2007. Check the license (California 20A10151, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Natalie Y. Chang
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20A10151 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1515 Newell Ave, Walnut Creek, CA 94596
- Phone
- (925) 295-4070
- Enumerated
- Nov 28, 2007
- Record last updated
- Dec 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20090728000668); 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 1515 Newell Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Natalie Y. Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A10151Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% more Medicare Part D claims than the average internal medicine physician in 2024
5,453 Medicare Part D claims for 982 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 70 claims were for opioids.
Most prescribed
- Atorvastatin Calcium589 claims
- Amlodipine Besylate345 claims
- Losartan Potassium331 claims
- Levothyroxine Sodium249 claims
- Lisinopril238 claims
- Atenolol151 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: $25.29
1 payment: food and beverage; the largest payer was Lilly USA, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Permanente Medical Group IncRichmond, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Natalie Y. Chang among 17,696 internal medicine physician records in California
Natalie Y. Chang, D.O. 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
- Graduated2006 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 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).
183 internal medicine physician records list a practice address in Walnut Creek
They are 183 of the 6,170 NPPES records with a practice address in Walnut Creek, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Walnut Creek → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Anthony Arroyo, MDWalnut Creek, CA 945961376621458
- Sheila Bhatia, MDWalnut Creek, CA 945961225135379
- Amrita Dhaliwal, MDWalnut Creek, CA 945961164500740
- Nellia Karakozova, MDWalnut Creek, CA 945961659459154
- Joseph Long, MDWalnut Creek, CA 945961225116379
- Roxanne McDaniel, MDWalnut Creek, CA 945961457439937
- Huu Nguyen, D.O.Walnut Creek, CA 945961811966492
- Jeff Ortiz, MDWalnut Creek, CA 945961891873964
Common questions
What is Natalie Y. Chang, D.O.'s NPI number?
Natalie Y. Chang, D.O.'s National Provider Identifier (NPI) is 1205018561, issued on Nov 28, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Natalie Y. Chang, D.O. located?
The NPPES record lists a practice address at 1515 Newell Ave, Walnut Creek, CA, 94596. Phone: (925) 295-4070. Providers update this record themselves, so call before visiting.
How can I verify Natalie Y. Chang, D.O.'s license?
NPPES lists California license number 20A10151, 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 Natalie Y. Chang, D.O. prescribe under Medicare Part D?
In 2024, Natalie Y. Chang, D.O. had 5,453 Medicare Part D claims for 982 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.