Independent US Healthcare Provider Directory & Public Medical Database Patient Guides

Wen Ma

Anesthesiology โ€ข Mountain View, CA

Active NPI 1992123798 Individual Practitioner Female Practitioner Accepts Medicare assignment
Practice location in NPPES

701 E El Camino Real
Mountain View, CA 940402833

Call 6504048444 Location details and other listings
Medical Disclaimer

This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.

Practice Location & Contact Primary Location

Practice Address

701 E El Camino Real

Mountain View, CA 940402833

Telephone 6504048444
Organization at the Same NPPES Address or Phone
Scott P. Wachhorst, M.d. A Professional Corporation Facility NPI 1093760795

Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.

Other Listings in Public Data

CMS Doctors and Clinicians lists 1 group name: Sutter Bay Medical Foundation. See the list

Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.

Listings do not confirm current availability, employment or a shared ownership network.

Medicare Profile & Education

Source: CMS Doctors and Clinicians National Downloadable File

Medical School

University Of California, San Francisco School Of Medicine

Graduation Year

2014

Medicare-allowed amount

About $471 in 2019

The total amount Medicare approved for these services in 2019. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.

What this does not show: Medicare-allowed amount

This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider and Service, 2019.

Paid by Medicare

About $375 in 2019

The part of the Medicare-allowed amount that Medicare itself paid in 2019, after patients' deductibles and coinsurance.

What this does not show: Paid by Medicare

This is not the clinician's income and not a measure of quality.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider and Service, 2019.

Industry payments (Open Payments)

Fewer than 11 payment records totaling $121.82 in 2025

Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.

These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.

General: payments not tied to research, such as meals, travel, consulting or speaking fees.

A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.

Source: CMS Open Payments, program year 2025.

Guide: How to read an Open Payments record

Years since graduation

12 years (graduated 2014)

CMS Doctors and Clinicians data list 2014 as the year this clinician finished professional school.

What this does not show: Years since graduation

It is not the number of years in practice, and more years does not mean better care.

Source: CMS Doctors and Clinicians National Downloadable File.

NPI first issued

2014

The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.

What this does not show: NPI first issued

NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.

Source: CMS NPPES NPI Registry.

Accepts Medicare assignment

CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.

Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.

Source: CMS Doctors and Clinicians; Medicare.gov, โ€œDoes your provider accept Medicare as full payment?โ€

Guide: What Medicare assignment means

No telehealth indicator

CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.

Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.

Guide: How Medicare covers telehealth

Enrolled in Medicare (PECOS)

Wen Ma has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.

It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What Medicare enrollment (PECOS) means

Can order Medicare-covered services

CMS lists Wen Ma as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.

What this does not show: Can order Medicare-covered services

It does not mean the clinician offers these services directly.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What ordering and referring status means

Compared with the same specialty in Mountain View and California

Billing and prescribing volume is not a quality rating.

Medicare Part B

Comparisons use 2024 data. The latest CMS data for Wen Ma are from 2019.

38 active clinicians are listed under Anesthesiology with a practice address in Mountain View, CA (7,574 in California).

Addresses are self-reported to NPPES and may be out of date.

Telehealth indicator in Mountain View

0% of these 38 clinicians have the CMS telehealth indicator.

76.3% of these 38 clinicians are listed by CMS as accepting Medicare assignment.

Sources: CMS Medicare Physician & Other Practitioners (2019), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.

Text: T-MedInfo ยท Report an error.

Pharma & Medical Device Financial Disclosures

Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments

Open Payments ยท Program Year 2025
Disclosure Year:

Program year 2025 (payments made January 1 โ€“ December 31, 2025): fewer than 11 records totaling $121.82.

Manufacturer Payment Nature Product Type Amount ($)
VERTEX PHARMACEUTICALS INCORPORATED
Food and Beverage
In-kind items and services
JOURNAVX General $121.82

Source: CMS Open Payments, program year 2025, released June 30, 2026.

Performed Procedures & Service Volume

Services billed to Original Medicare Part B in 2019.

CMS Part B ยท Data Year 2019

CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2018 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ€“ by Provider and Service data, 2019; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.

HCPCS Code Services Patients Submitted Charge Medicare Allowed
76942 Ultrasonic guidance for needle placement
13 13 $322.00 $36.23

Source: CMS Part B by Provider and Service, 2019; services under 11 beneficiaries omitted by CMS. Privacy limits

Submitted charges are billed amounts, not a price quote for your visit.

Specialties & License Numbers Reported to NPPES

Self-certified to NPPES: 2025-01-07
Anesthesiology Primary Specialty

NUCC Taxonomy Code: 207L00000X

License # reported to NPPES CA A137994

An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.

Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: Medical Board of California.
Look Up on State Board Site

Medicare (PECOS) Enrollment & Ordering Eligibility

Source: CMS PECOS
Medicare FFS Enrollment Status Medicare Enrollment on File
CMS Provider Specialty

PRACTITIONER - ANESTHESIOLOGY

Medicare Enrollment ID

I20190611003550

Enrollment State Jurisdiction

CA

PECOS Control ID

0042543795

Medicare Order & Referring Eligibility
Clinical Lab & Imaging (Part B) Eligible
Durable Medical Equipment (DME) Eligible
Home Health Agency (HHA) Eligible
Power Mobility Devices (PMD) Eligible

Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.

Medicare Group Practice Enrollments

Source: CMS Doctors and Clinicians National Downloadable File

Sutter Bay Medical Foundation

123 S San Mateo Dr, San Mateo, CA 944013804

Phone: 6503434200

Sutter Bay Medical Foundation

170 Alameda De Las Pulgas, Redwood City, CA 940622751

Phone: 6503695811

Clinicians Sharing This Practice Address or Phone

Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.

16 listed
NPI 1982191672

Doctor of Medicine (M.D.)

NPI 1669422705

Doctor of Medicine (M.D.)

Dr. Trevor Chan , MD

Anesthesiology

NPI 1124310545

Doctor of Medicine (M.D.)

NPI 1588878060

Doctor of Medicine (M.D.)

Dr. Mengxi Ji , MD

Anesthesiology

NPI 1306340757

Doctor of Medicine (M.D.)

Dr. Amit Joseph , MD

Anesthesiology

NPI 1033476486

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status

11 Historical Events
๐Ÿ“
Updated Practice Location January 07, 2025

Registered at 701 E EL CAMINO REAL, MOUNTAIN VIEW, CA 940402833 (Tel: 6504048444)

๐Ÿ“
Updated Business Mailing Address January 07, 2025

Registered at PO BOX 276950, SACRAMENTO, CA 958276950

๐Ÿ“
Updated Practice Location June 17, 2019

Registered at 751 S BASCOM AVE, SAN JOSE, CA 951282604 (Tel: 4088855000)

๐Ÿ“
Updated Business Mailing Address June 17, 2019

Registered at 751 S BASCOM AVE, SAN JOSE, CA 951282604 (Tel: 4088855000)

๐ŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) May 15, 2019

Anesthesiology (license number reported to NPPES: CA A137994)

โœ…
NPI Profile Active March 31, 2014

NPI status registered as active in NPPES database

๐Ÿ“
Practice Location (Initial Record) March 31, 2014

Registered at 280 W MACARTHUR BLVD, OAKLAND, CA 946115642 (Tel: 5107527823)

๐Ÿ“
Business Mailing Address (Initial Record) March 31, 2014

Registered at 280 W MACARTHUR BLVD, OAKLAND, CA 946115642

๐Ÿ‘ค
Provider Name / Credentials (Initial Record) March 31, 2014

Recorded as WEN MA

๐ŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) March 31, 2014

Student in an Organized Health Care Education/Training Program

๐ŸŸข
Initial NPI Registration & Enumeration March 31, 2014

First registered as active Individual Practitioner in NPPES Database.

No reviews have been published yet. Leave a review.

NPI Administrative Meta

NPI Number: 1992123798
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: March 31, 2014
Last Update: January 07, 2025
Sole Proprietor: No

Other Anesthesiology Specialists in Mountain View

All Anesthesiology Specialists in Mountain View

Mailing Address

Po Box 276950

Sacramento, CA 958276950

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.