DR. SHAMSUNDAR RAMRATTAN D.O.
NPI 1598968844
Internal Medicine in Canyon Country, CA
About Dr. Shamsundar Ramrattan D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. SHAMSUNDAR RAMRATTAN D.O. (NPI 1598968844) is an individual internal medicine provider in Canyon Country, California, licensed in California (2OA6991) and active in the NPI registry since June 2007. He is enrolled in Medicare PECOS and is a graduate of Des Moines University Of Osteopathic Medicine And Health Sciences (1993).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Shamsundar Ramrattan D.o. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
5Medicare enrollment records show Shamsundar Ramrattan reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Sylmar, CA 91342
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: County Of Los Angeles
- 1,939 clinicians in this Medicare group
West Hills, CA 91304
- Reassigned Medicare billing, California enrollment
- 205 clinicians in this Medicare group
Lancaster, CA 93534
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: High Desert Medical Corporation
- 81 clinicians in this Medicare group
Victorville, CA 92395
- Reassigned Medicare billing, California enrollment
- 12 clinicians in this Medicare group
Bakersfield, CA 93312
- Reassigned Medicare billing, California enrollment
- 225 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 91387 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Shamsundar Ramrattan's NPI number?
The NPI number for Shamsundar Ramrattan is 1598968844. It was assigned to this individual provider in the NPPES registry on June 6, 2007.
Where is Shamsundar Ramrattan located?
Shamsundar Ramrattan practices at 28504 Colhary Ct, Canyon Country, CA 91387. The listed phone number is (661) 252-7580.
What is Shamsundar Ramrattan's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Shamsundar Ramrattan enrolled in Medicare?
Yes. Shamsundar Ramrattan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Shamsundar Ramrattan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Shamsundar Ramrattan reassigns Medicare benefits to 5 organizations: County Of Los Angeles Auditor Controller (Sylmar, CA), Lakeside Medical Organization, A Medical Group Inc. (West Hills, CA), High Desert Medical Group (Lancaster, CA), Choice Urgent Care (Victorville, CA) and Emergency Physicians Urgent Care Inc. (Bakersfield, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Shamsundar Ramrattan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Shamsundar Ramrattan was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Shamsundar Ramrattan, D.O. · NPI 1598968844
Internal Medicine physician in Canyon Country, California. Individual provider, active in the CMS NPPES registry since June 6, 2007.
## Identity
- **NPI:** 1598968844 (Entity type: Individual)
- **Enumerated:** June 6, 2007
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 2OA6991 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 28504 COLHARY CT, Canyon Country, CA 91387-5316
- **Phone:** (661) 252-7580
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): County Of Los Angeles Auditor Controller (NPI 1134159320, Sylmar, CA); Lakeside Medical Organization, A Medical Group Inc. (NPI 1831426642, West Hills, CA); High Desert Medical Group (NPI 1720196702, Lancaster, CA); Choice Urgent Care (NPI 1316774243, Victorville, CA); Emergency Physicians Urgent Care Inc. (NPI 1689963845, Bakersfield, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Des Moines University Of Osteopathic Medicine And Health Sciences, class of 1993
## Record status
- **NPPES last updated:** July 8, 2007
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Source: [NPI Profile](https://npiprofile.com/npi/1598968844) · Data from the CMS NPPES public registry.