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DR. JAMES WELDON MAAS M.D. PH.D.
NPI 1255506788
Psychiatry & Neurology - Neurology in San Francisco, CA

Active since April 25, 2008PECOS EnrolledAccepts Medicare Assignment
74.46/100
CMS Quality Rating
505 PARNASSUS AVENUE, UCSF DEPARTMENT OF NEUROLOGY, SAN FRANCISCO, CA 94143(415) 476-1489 Get Directions Write a Review

NPPES record last updated: April 25, 2008. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. James Weldon Maas M.d. Ph.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. JAMES WELDON MAAS M.D. PH.D. (NPI 1255506788) is an individual neurology provider in San Francisco, California, licensed in California (A102712) and active in the NPI registry since April 2008. He is enrolled in Medicare PECOS and is a graduate of Washington University School Of Medicine (2006).

NPPES Registry Identity

NPI1255506788
Entity TypeIndividualMale
Primary Taxonomy2084N0400X
Provider Legal NameDR. JAMES WELDON MAASCredential: M.D. PH.D.
Location Address505 PARNASSUS AVENUE, UCSF DEPARTMENT OF NEUROLOGYSan Francisco, CA 94143-0114
Mailing Address505 Parnassus Avenue Box 0114, Ucsf Department Of NeurologySan Francisco, CA 94143-0114
Phone(415) 476-1489
Sole ProprietorNo
Medical School CMSWashington University School Of MedicineGraduated 2006
Enumeration DateApril 25, 2008
✔ NPI 1255506788 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · NeurologyAllopathic & Osteopathic Physicians
Taxonomy Code2084N0400X
License✔ Licensed in CA · A102712
Definition
A Neurologist specializes in the diagnosis and treatment of diseases or impaired function of the brain, spinal cord, peripheral nerves, muscles, autonomic nervous system, and blood vessels that relate to these structures.
505 PARNASSUS AVENUE, San Francisco, CA 94143
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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. James Weldon Maas M.d. Ph.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.

PECOS PAC ID4789716226
PECOS Enrollment IDI20100719000325
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show James Maas reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

University Of California San Francisco
0.1 mi
Surgery
400 PARNASSUS AVE, MCB 300
San Francisco, CA 94143
  • Reassigned Medicare billing, California enrollment
  • 5,645 clinicians in this Medicare group
NPI 1346329380 (415) 353-2161
Ucsf Medical Group Business Services
0.1 mi
Internal Medicine
400 PARNASSUS AVE
San Francisco, CA 94122
  • Reassigned Medicare billing, California enrollment
  • 5,544 clinicians in this Medicare group
NPI 1477624104 (415) 353-2808

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 4

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.

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
142 services84 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
49 services38 patients
Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or G2212
This service refers to extended doctor visits where your healthcare provider spends additional time evaluating and managing your health beyond the primary procedure's required time. This includes each extra 15 minutes spent by the physician on the same day as the primary service.
49 services22 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
21 services18 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94143 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

74.46/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Promoting Interoperability76
Improvement Activities40
Cost46.68

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.

UNIVERSITY OF CALIFORNIA, SAN FRANCISCO
General Acute Care Hospital
505 PARNASSUS AVENUE
SAN FRANCISCO, CA 94143
San Francisco County (415) 353-2742
DR. ELIZABETH MADELEINE EDWINA COLE MBBS
Anesthesiology
505 PARNASSUS AVENUE, DEPARTMENT OF ANESTHESIA AT UCSF
SAN FRANCSICO, CA 94143
San Francisco County (415) 476-1000
UNIVERSITY OF CALIFORNIA, SAN FRANCISCO
General Acute Care Hospital
505 PARNASSUS AVENUE
SAN FRANCISCO, CA 94143
San Francisco County (415) 353-2742
RUTH ZHANG
Pathology (Anatomic Pathology & Clinical Pathology)
505 PARNASSUS AVENUE
SAN FRANCISCO, CA 94143
San Francisco County (415) 353-1613
MEGHAN HEWLETT MD
Emergency Medicine
505 PARNASSUS AVENUE, ROOM M-24, BOX #0203
SAN FRANCISCO, CA 94143
San Francisco County (415) 353-1529
SUHAS RAO
Student in an Organized Health Care Education/Training Program
505 PARNASSUS AVENUE
SAN FRANCISCO, CA 94143
San Francisco County (415) 476-1528
UNIVERSITY OF CALIFORNIA, SAN FRANCISCO
General Acute Care Hospital
505 PARNASSUS AVENUE
SAN FRANCISCO, CA 94143
San Francisco County (415) 353-2742
GALEN LASERSON BUSSMANN MD, MBA
Emergency Medicine
505 PARNASSUS AVENUE
SAN FRANCISCO, CA 94143
San Francisco County (415) 353-1529

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 James Maas's NPI number?

The NPI number for James Maas is 1255506788. It was assigned to this individual provider in the NPPES registry on April 25, 2008.

Where is James Maas located?

James Maas practices at 505 Parnassus Avenue Ucsf Department Of Neurology, San Francisco, CA 94143. The listed phone number is (415) 476-1489.

What is James Maas's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurology, with taxonomy code 2084N0400X.

Is James Maas enrolled in Medicare?

Yes. James Maas 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 James Maas's services?

According to the CMS Revalidation Reassignment List (October 2026 release), James Maas reassigns Medicare benefits to 2 organizations: University Of California San Francisco (San Francisco, CA) and Ucsf Medical Group Business Services (San Francisco, 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 James Maas'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 James Maas was last updated on April 25, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.