ISLA ELISABETH HUTCHINSON MADDOX MD
NPI 1285336206
Internal Medicine in Stanford, CA
About Isla Elisabeth Hutchinson Maddox Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ISLA ELISABETH HUTCHINSON MADDOX MD (NPI 1285336206) is an individual internal medicine provider in Stanford, California, licensed in California (A208702) and active in the NPI registry since March 2023. She is enrolled in Medicare PECOS, maintains a secondary practice location in Boston, and is a graduate of Icahn School Of Medicine At Mount Sinai (2023).
NPPES Registry Identity
Specialties & Licenses
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
Isla Elisabeth Hutchinson Maddox 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
2Medicare enrollment records show Isla Hutchinson Maddox reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Stanford, CA 94305
- Reassigned Medicare billing, California enrollment
- 4,258 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94305 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
STANFORD, CA 94305
STANFORD, CA 94305
STANFORD, CA 94305
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 Isla Hutchinson Maddox's NPI number?
The NPI number for Isla Hutchinson Maddox is 1285336206. It was assigned to this individual provider in the NPPES registry on March 21, 2023.
Where is Isla Hutchinson Maddox located?
Isla Hutchinson Maddox practices at 300 Pasteur Dr, Stanford, CA 94305. The listed phone number is (650) 723-4000.
What is Isla Hutchinson Maddox's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Isla Hutchinson Maddox enrolled in Medicare?
Yes. Isla Hutchinson Maddox 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 Isla Hutchinson Maddox's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Isla Hutchinson Maddox reassigns Medicare benefits to 2 organizations: Stanford Health Care (Stanford, 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 Isla Hutchinson Maddox'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 Isla Hutchinson Maddox was last updated on July 1, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Isla Elisabeth Hutchinson Maddox, MD · NPI 1285336206
Internal Medicine physician in Stanford, California. Individual provider, active in the CMS NPPES registry since March 21, 2023.
## Identity
- **NPI:** 1285336206 (Entity type: Individual)
- **Enumerated:** March 21, 2023
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A208702 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 PASTEUR DR, Stanford, CA 94305-2200
- **Phone:** (650) 723-4000
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Stanford Health Care (NPI 1437292927, Stanford, CA); Lpch Medical Group Div Of Lucile (NPI 1417907940, Palo Alto, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Icahn School Of Medicine At Mount Sinai, class of 2023
## Record status
- **NPPES last updated:** July 1, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1285336206) · Data from the CMS NPPES public registry.