Shamsundar Ramrattan, D.O.
Internal Medicine Physician · Canyon Country, CA
Shamsundar Ramrattan, D.O. is an internal medicine physician with a practice address in Canyon Country, California, and NPI 1598968844, issued on Jun 6, 2007. Check the license (California 2OA6991, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Shamsundar Ramrattan
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 2OA6991 CA
Self-reported in NPPES; status is on the state search - Practice location
- 28504 Colhary CT, Canyon Country, CA 91387
- Phone
- (661) 252-7580
- Enumerated
- Jun 6, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20051107000792); accepts Medicare assignment
- Medical or professional school
- Des Moines University Of Osteopathic Medicine And Health Sciences, 1993
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Shamsundar Ramrattan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 2OA6991Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average internal medicine physician in 2024
167 Medicare Part D claims for 98 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.
Most prescribed
- Azithromycin20 claims
- Cephalexin16 claims
- Methylprednisolone15 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): 84 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: $43.92
2 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. 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 2 group practices
- Choice Urgent CareVictorville, CA
- Lakeside Medical Organization A Medical Group IncBurbank, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Shamsundar Ramrattan among 17,696 internal medicine physician records in California
Shamsundar Ramrattan, 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
- Graduated1993 · median 2004 among the 11,065 with a school on file
- Record last updated2007 · 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).
12 internal medicine physician records list a practice address in Canyon Country
They are 12 of the 268 NPPES records with a practice address in Canyon Country, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Canyon Country → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Tarannum Alam, MD.Canyon Country, CA 913871801814231
- Unber Ali, M.D.Canyon Country, CA 913871588897045
- Erik Davydov, M.D.Canyon Country, CA 913871336173582
- Ghazaleh Erfanzadeh, MD.Canyon Country, CA 913871922398510
- Alejandra Green, M.D.Canyon Country, CA 913871205221694
- Jin Hur, D.O.Canyon Country, CA 913871669978524
- Vernon Lackman, M.D.Canyon Country, CA 913871174554646
- Byong-Wha Lee, MDCanyon Country, CA 913871881613412
Common questions
What is Shamsundar Ramrattan, D.O.'s NPI number?
Shamsundar Ramrattan, D.O.'s National Provider Identifier (NPI) is 1598968844, issued on Jun 6, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Shamsundar Ramrattan, D.O. located?
The NPPES record lists a practice address at 28504 Colhary CT, Canyon Country, CA, 91387. Phone: (661) 252-7580. Providers update this record themselves, so call before visiting.
How can I verify Shamsundar Ramrattan, D.O.'s license?
NPPES lists California license number 2OA6991, 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 Shamsundar Ramrattan, D.O. prescribe under Medicare Part D?
In 2024, Shamsundar Ramrattan, D.O. had 167 Medicare Part D claims for 98 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Shamsundar Ramrattan, D.O.'s MIPS final score?
The 2023 MIPS final score is 84 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.