DR. MAGGIE J SO M.D.
NPI 1487887105
Internal Medicine in San Francisco, CA
About Dr. Maggie J So M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MAGGIE J SO M.D. (NPI 1487887105) is an individual internal medicine provider in San Francisco, California, licensed in California (A102991) and active in the NPI registry since August 2009. She is enrolled in Medicare PECOS and is a graduate of New York Medical College (2006).
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. Maggie J So M.d. 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 Reassignment
Medicare enrollment records show Maggie So reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
San Francisco, CA 94109
- Reassigned Medicare billing, California enrollment
- 213 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 2
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 94115 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.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Maggie So's NPI number?
The NPI number for Maggie So is 1487887105. It was assigned to this individual provider in the NPPES registry on August 27, 2009.
Where is Maggie So located?
Maggie So practices at 2351 Clay St Ste 360, San Francisco, CA 94115. The listed phone number is (415) 600-6000.
What is Maggie So's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Maggie So enrolled in Medicare?
Yes. Maggie So 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 organization bills Medicare for Maggie So's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Maggie So reassigns Medicare benefits to Pacific Inpatient Medical Group (San Francisco, CA). The 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 Maggie So'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 Maggie So was last updated on July 3, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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. Maggie J So, M.D. · NPI 1487887105
Internal Medicine physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since August 27, 2009.
## Identity
- **NPI:** 1487887105 (Entity type: Individual)
- **Enumerated:** August 27, 2009
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A102991 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2351 CLAY ST STE 360, San Francisco, CA 94115-1931
- **Phone:** (415) 600-6000
## 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:** Pacific Inpatient Medical Group (NPI 1447447248, San Francisco, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York Medical College, class of 2006
## Record status
- **NPPES last updated:** July 3, 2013
---
Source: [NPI Profile](https://npiprofile.com/npi/1487887105) · Data from the CMS NPPES public registry.