Nathan Sim Marriott, DPT
Physical Therapist · Granada Hills, CA
Nathan Sim Marriott, DPT is a physical therapist with a practice address in Granada Hills, California, and NPI 1083584213, issued on Nov 11, 2025. Check the license (California 309138, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Nathan Sim Marriott
- Credential
- DPT
- Primary taxonomy
- Physical Therapist 225100000X
- License number
- 309138 CA
Self-reported in NPPES; status is on the state search - Practice location
- 11858 1/2 Balboa Blvd, Granada Hills, CA 91344
- Phone
- (818) 217-4868
- Enumerated
- Nov 11, 2025
- Record last updated
- Nov 11, 2025
- Medicare enrollment
- Enrolled (PECOS I20251210004003); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physical therapist records → All 22,531 in California → Look up another NPI →
Also registered at 11858 1/2 Balboa Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Julia Fetherman, PTPhysical Therapist1225115017
- Sophia Qadir, DPTPhysical Therapist1942767561
Verify Nathan Sim Marriott in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 309138Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- North Valley Physical Therapy IncGranada Hills, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathan Sim Marriott among 22,531 physical therapist records in California
Nathan Sim Marriott, DPT is one of 22,531 physical therapist records with a practice address in California. 32% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2025, is newer than 92% of them.
- NPI issued2025 · 92% of these records are older, 3% newer
- In a Medicare fileYes · 32% of these records are
- In the CMS Doctors and Clinicians fileYes · 34% of these records are
- Graduated2025 · median 2017 among the 7,751 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 225100000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
55 physical therapist records list a practice address in Granada Hills
They are 55 of the 671 NPPES records with a practice address in Granada Hills, and 22,531 physical therapist records in California.
All 22,531 in California → Every provider in Granada Hills → Physical Therapist nationwide →
The 8 physical therapist records with the nearest ZIP codes
- Amy Blieden, PTGranada Hills, CA 913441730202730
- Kirk Briggs, P.T.Granada Hills, CA 913441104043173
- Nancy Briley, R.P.T.Granada Hills, CA 913441528181765
- Katherine Colletto, P.T.Granada Hills, CA 913441477511376
- Julia Fetherman, PTGranada Hills, CA 913441225115017
- Carla Kazimir, PTGranada Hills, CA 913441639247596
- Simone Kelman, R.P.T.Granada Hills, CA 913441801938113
- Lorraine Macnaughton, PTGranada Hills, CA 913441801013875
Common questions
What is Nathan Sim Marriott, DPT's NPI number?
Nathan Sim Marriott, DPT's National Provider Identifier (NPI) is 1083584213, issued on Nov 11, 2025. An NPI identifies a provider in billing; it is not a license.
Where is Nathan Sim Marriott, DPT located?
The NPPES record lists a practice address at 11858 1/2 Balboa Blvd, Granada Hills, CA, 91344. Phone: (818) 217-4868. Providers update this record themselves, so call before visiting.
How can I verify Nathan Sim Marriott, DPT's license?
NPPES lists California license number 309138, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity 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.