DR. DAVID JOHN WALLACE MD, MPH
NPI 1770780835
Internal Medicine - Critical Care Medicine in Castro Valley, CA
About Dr. David John Wallace Md, Mph NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. DAVID JOHN WALLACE MD, MPH (NPI 1770780835) is an individual critical care medicine provider in Castro Valley, California, licensed in California (C170028) and active in the NPI registry since June 2007. He is enrolled in Medicare PECOS and is a graduate of Other (2004).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
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. David John Wallace Md, Mph 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 David Wallace reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Leandro, CA 94578
- Reassigned Medicare billing, California enrollment
- 900 clinicians in this Medicare group
Palo Alto, CA 94306
- Reassigned Medicare billing, California enrollment
- 2,460 clinicians in this Medicare group
San Bernardino, CA 92404
- Reassigned Medicare billing, California enrollment
- 1,216 clinicians in this Medicare group
East Liverpool, OH 43920
- Reassigned Medicare billing, Pennsylvania enrollment
- 7,114 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 7
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 94546 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.
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 David Wallace's NPI number?
The NPI number for David Wallace is 1770780835. It was assigned to this individual provider in the NPPES registry on June 29, 2007.
Where is David Wallace located?
David Wallace practices at 20103 Lake Chabot Rd, Castro Valley, CA 94546. The listed phone number is (510) 537-1234.
What is David Wallace's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is David Wallace enrolled in Medicare?
Yes. David Wallace 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 David Wallace's services?
According to the CMS Revalidation Reassignment List (October 2026 release), David Wallace reassigns Medicare benefits to 4 organizations: Alameda Health System (San Leandro, CA), County Of Santa Clara (Palo Alto, CA), Inpatient Specialists Of California, PC (San Bernardino, CA) and University Of Pittsburgh Physicians (East Liverpool, OH). 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 David Wallace's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does David Wallace accept?
Health plans from Blue Cross and Blue Shield of Texas, CHRISTUS Health Plan and Oscar Insurance Company list David Wallace as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for David Wallace was last updated on August 30, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Dr. David John Wallace, MD, MPH · NPI 1770780835
Critical Care Medicine physician in Castro Valley, California. Individual provider, active in the CMS NPPES registry since June 29, 2007.
## Identity
- **NPI:** 1770780835 (Entity type: Individual)
- **Enumerated:** June 29, 2007
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** C170028 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 20103 LAKE CHABOT RD, Castro Valley, CA 94546-5305
- **Phone:** (510) 537-1234
## 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): Alameda Health System (NPI 1558749440, San Leandro, CA); County Of Santa Clara (NPI 1285228080, Palo Alto, CA); Inpatient Specialists Of California, PC (NPI 1952792475, San Bernardino, CA); University Of Pittsburgh Physicians (NPI 1811945793, East Liverpool, OH) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2004
## Record status
- **NPPES last updated:** August 30, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1770780835) · Data from the CMS NPPES public registry.