STEVEN BARRY MACHTINGER MD
NPI 1093719437
Pediatrics - Pediatric Allergy/Immunology in San Francisco, CA
About Steven Barry Machtinger Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
STEVEN BARRY MACHTINGER MD (NPI 1093719437) is an individual pediatric allergy/immunology provider in San Francisco, California, licensed in California (G42041) and active in the NPI registry since June 2005. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of University Of Pittsburgh School Of Medicine (1977).
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Locations 2
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 Barry Machtinger 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 Machtinger reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 82 clinicians in this Medicare group
Emeryville, CA 94608
- Reassigned Medicare billing, California enrollment
- 4,258 clinicians in this Medicare group
San Mateo, CA 94401
- Reassigned Medicare billing, California enrollment
- 2 clinicians in this Medicare group
Palo Alto, CA 94304
- Reassigned Medicare billing, California enrollment
- 3,617 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 10
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.
Other Providers at the Same Location NPPES 14
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAN FRANCISCO, CA 94108
SAN FRANCISCO, CA 94108
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 Machtinger's NPI number?
The NPI number for Steven Machtinger is 1093719437. It was assigned to this individual provider in the NPPES registry on June 13, 2005.
Where is Steven Machtinger located?
Steven Machtinger practices at 450 Sutter St Rm 933, San Francisco, CA 94108. The listed phone number is (415) 362-5443.
What is Steven Machtinger's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Allergy/Immunology, with taxonomy code 2080P0201X.
Is Steven Machtinger enrolled in Medicare?
Yes. Steven Machtinger 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 Machtinger's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Steven Machtinger reassigns Medicare benefits to 4 organizations: Regents Of The University Of California - Ucsf (San Francisco, CA), Stanford Health Care (Emeryville, CA), Steven Machtinger MD & Associates Inc (San Mateo, CA) and Lpch Medical Group Div Of Lucile (Palo Alto, 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 Machtinger'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 Machtinger was last updated on December 12, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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 Barry Machtinger, MD · NPI 1093719437
Pediatric Allergy/Immunology physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since June 13, 2005.
## Identity
- **NPI:** 1093719437 (Entity type: Individual)
- **Enumerated:** June 13, 2005
- **Primary specialty:** Pediatrics - Pediatric Allergy/Immunology · taxonomy 2080P0201X
- **State license:** G42041 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 450 SUTTER ST RM 933, San Francisco, CA 94108-3997
- **Phone:** (415) 362-5443
## 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): Regents Of The University Of California - Ucsf (NPI 1265890263, San Francisco, CA); Stanford Health Care (NPI 1275076325, Emeryville, CA); Steven Machtinger MD & Associates Inc (NPI 1427288133, San Mateo, CA); Lpch Medical Group Div Of Lucile (NPI 1417907940, Palo Alto, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Pittsburgh School Of Medicine, class of 1977
## Record status
- **NPPES last updated:** December 12, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1093719437) · Data from the CMS NPPES public registry.