STEVEN SINFIELD MD
NPI 1013545979
Hospitalist in Pasadena, CA
About Steven Sinfield Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
STEVEN SINFIELD MD (NPI 1013545979) is an individual hospitalist provider in Pasadena, California, licensed in California (A183275) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS, maintains a secondary practice location in Redlands, and is a graduate of Other (2020).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
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
Steven Sinfield Md 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
4Medicare enrollment records show Steven Sinfield reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Los Angeles, CA 90041
- Reassigned Medicare billing, California enrollment
- 13,921 clinicians in this Medicare group
Los Angeles, CA 90015
- Reassigned Medicare billing, California enrollment
- 2,052 clinicians in this Medicare group
Fountain Valley, CA 92708
- Reassigned Medicare billing, California enrollment
- 948 clinicians in this Medicare group
Redlands, CA 92373
- Reassigned Medicare billing, California enrollment
- 635 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.
Areas of Expertise CMS Part B claims 6
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 91105 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 15
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PASADENA, CA 91105
PASADENA, CA 91105
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 Steven Sinfield's NPI number?
The NPI number for Steven Sinfield is 1013545979. It was assigned to this individual provider in the NPPES registry on March 27, 2020.
Where is Steven Sinfield located?
Steven Sinfield practices at 797 S Fair Oaks Ave, Pasadena, CA 91105. The listed phone number is (626) 795-2244.
What is Steven Sinfield's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Steven Sinfield enrolled in Medicare?
Yes. Steven Sinfield 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 Steven Sinfield's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Steven Sinfield reassigns Medicare benefits to 4 organizations: Southern California Permanente Medical Group (Los Angeles, CA), Healthcare Partners Affiliates Medical Group (Los Angeles, CA), Memorialcare Medical Foundation (Fountain Valley, CA) and Beaver Medical Group P C (Redlands, 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 Steven Sinfield'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 Steven Sinfield was last updated on January 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months 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.
# Steven Sinfield, MD · NPI 1013545979
Hospitalist physician in Pasadena, California. Individual provider, active in the CMS NPPES registry since March 27, 2020.
## Identity
- **NPI:** 1013545979 (Entity type: Individual)
- **Enumerated:** March 27, 2020
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** A183275 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 797 S FAIR OAKS AVE, Pasadena, CA 91105-2629
- **Phone:** (626) 795-2244
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Southern California Permanente Medical Group (NPI 1013409044, Los Angeles, CA); Healthcare Partners Affiliates Medical Group (NPI 1659312593, Los Angeles, CA); Memorialcare Medical Foundation (NPI 1205167350, Fountain Valley, CA); Beaver Medical Group P C (NPI 1649503319, Redlands, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** January 11, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1013545979) · Data from the CMS NPPES public registry.