Clark T. Bach, M.D.
Internal Medicine Physician · Vista, CA
Clark T. Bach, M.D. is an internal medicine physician with a practice address in Vista, California, and NPI 1831579689, issued on Jun 8, 2015. Check the license (California A155470, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Clark T. Bach
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A155470 CA
Self-reported in NPPES; status is on the state search - Practice location
- 130 Cedar RD Ste 210, Vista, CA 92083
- Phone
- (760) 806-5500
- Enumerated
- Jun 8, 2015
- Record last updated
- Jun 15, 2025
- Medicare enrollment
- Enrolled (PECOS I20181231000875); 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 →
Verify Clark T. Bach in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A155470Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
17% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,621 Medicare Part D claims for 347 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 52 claims were for opioids.
Most prescribed
- Atorvastatin Calcium146 claims
- Amlodipine Besylate120 claims
- Levothyroxine Sodium119 claims
- Losartan Potassium106 claims
- Rosuvastatin Calcium104 claims
- Lisinopril103 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: $401.32
20 payments; by number, the most common kind was food and beverage; the largest payer was Genzyme Corporation. 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
- Scripps HealthVista, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Clark T. Bach among 17,696 internal medicine physician records in California
Clark T. Bach, 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 2015, is newer than 76% of them.
- NPI issued2015 · 76% of these records are older, 21% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2015 · median 2004 among the 11,065 with a school on file
- Record last updated2025 · 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).
43 internal medicine physician records list a practice address in Vista
They are 43 of the 2,017 NPPES records with a practice address in Vista, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Vista → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Emad Abu-Khieran, MDVista, CA 920831558314237
- Kristin Bell, M.D.Vista, CA 920831154335891
- Sanjana Chaturvedi, MDVista, CA 920831881630457
- Farzaneh Hassani, MDVista, CA 920831942204979
- John Lafata, MDVista, CA 920831285662403
- Kiran Mahl-Sansone, M.D., INC.Vista, CA 920831245276815
- Mark O'Brien, D.O.Vista, CA 920831497744247
- Gerald Ondash, MDVista, CA 920831730102153
Common questions
What is Clark T. Bach, M.D.'s NPI number?
Clark T. Bach, M.D.'s National Provider Identifier (NPI) is 1831579689, issued on Jun 8, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Clark T. Bach, M.D. located?
The NPPES record lists a practice address at 130 Cedar RD Ste 210, Vista, CA, 92083. Phone: (760) 806-5500. Providers update this record themselves, so call before visiting.
How can I verify Clark T. Bach, M.D.'s license?
NPPES lists California license number A155470, 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 Clark T. Bach, M.D. prescribe under Medicare Part D?
In 2024, Clark T. Bach, M.D. had 2,621 Medicare Part D claims for 347 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.