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DR. LESS T CHAFEN M.D.
NPI 1336131689
Radiology - Diagnostic Radiology in Walnut Creek, CA

Active since August 22, 2005PECOS Enrolled
90.81/100
CMS Quality Rating
2125 OAK GROVE RD, #200, WALNUT CREEK, CA 94598(925) 296-7150(925) 296-7171 Get Directions Write a Review

NPPES record last updated: April 2, 2015. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Less T Chafen M.d. NPPES

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

DR. LESS T CHAFEN M.D. (NPI 1336131689) is an individual diagnostic radiology provider in Walnut Creek, California, licensed in California (G17994) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1336131689
Entity TypeIndividualMale
Primary Taxonomy2085R0202X
Provider Legal NameDR. LESS T CHAFENCredential: M.D.
Location Address2125 OAK GROVE RD, #200Walnut Creek, CA 94598-2536
Mailing Address2125 Oak Grove Rd, #200Walnut Creek, CA 94598-2536 · (925) 296-7150 · Fax (925) 296-7171
Phone(925) 296-7150
Fax(925) 296-7171
Sole ProprietorNo
Enumeration DateAugust 22, 2005
Last NPPES UpdateApril 2, 2015
✔ NPI 1336131689 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians
Taxonomy Code2085R0202X
License✔ Licensed in CA · G17994
Definition
A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.
2125 OAK GROVE RD, Walnut Creek, CA 94598
Open in Google Maps ↗

Other Identifiers 2

Medicare UPINA89284CA
Medicare PIN00G179940

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Less T Chafen M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Reassignment

Medicare enrollment records show Less Chafen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Bay Imaging Consultants Medical Group Inc
Same address
Diagnostic Radiology
2125 OAK GROVE RD STE 200
Walnut Creek, CA 94598
  • Reassigned Medicare billing, California enrollment
  • 181 clinicians in this Medicare group
NPI 1831756139 (925) 296-7150

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 10

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.

Screening mammography 77067
Screening mammography is a preventative measure that uses low-dose X-rays to take images of the chest area. It's a key tool in early detection of abnormalities, helping to identify issues before they become symptomatic. It is recommended annually for certain age groups.
270 services270 patients
Dxa bone density measurement of hip, pelvis, spine 77080
A DXA bone density measurement is a simple, quick, and non-invasive procedure that assesses the strength of your bones. This test uses X-rays to measure the amount of minerals, mainly calcium, in the hip, pelvis, and spine. It helps in early detection of osteoporosis or other bone diseases.
262 services262 patients
Screening 3d breast mammography 77063
Screening 3D breast mammography is a procedure that uses low-dose X-rays to create detailed images of the breast. This allows for early detection of any unusual changes or growths. It's a non-invasive, outpatient procedure that typically takes about 30 minutes.
250 services250 patients
Screening mammography 77067
Screening mammography is a preventative measure that uses low-dose X-rays to take images of the chest area. It's a key tool in early detection of abnormalities, helping to identify issues before they become symptomatic. It is recommended annually for certain age groups.
217 services217 patients
Screening 3d breast mammography 77063
Screening 3D breast mammography is a procedure that uses low-dose X-rays to create detailed images of the breast. This allows for early detection of any unusual changes or growths. It's a non-invasive, outpatient procedure that typically takes about 30 minutes.
133 services133 patients
Diagnostic digital breast tomosynthesis, unilateral or bilateral (list separately in addition to 77065 or 77066) G0279
Diagnostic digital breast tomosynthesis is a 3D imaging test that allows doctors to examine your breast tissue layer by layer. It's performed on one or both sides. It helps in detecting abnormalities more accurately. It's often done in addition to other tests.
93 services92 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94598 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
$104.51 typical visit price
range $69.00 – $202.35
Typical copayment $26.12 (range $17.25 – $50.58)
Most-billed visit code 99203
Established Patient
$84.91 typical visit price
range $23.44 – $166.46
Typical copayment $21.22 (range $5.86 – $41.61)
Most-billed visit code 99213
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.

90.81/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality85.12
Improvement Activities40

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.

DR. PHILIP J. RICH MD
Radiology (Diagnostic Radiology)
2125 OAK GROVE RD, #200
WALNUT CREEK, CA 94598
Contra Costa County (925) 296-7150
DR. JONATHAN FISH M.D.
Radiology (Diagnostic Radiology)
2125 OAK GROVE RD, SUITE 200
WALNUT CREEK, CA 94598
Contra Costa County (925) 296-7150
DR. JOSEPH CHAN M.D.
Radiology (Diagnostic Radiology)
2125 OAK GROVE RD, SUITE 200
WALNUT CREEK, CA 94598
Contra Costa County (925) 296-7150
DR. ASEEM OM RAWAL M.D.
Radiology (Diagnostic Radiology)
2125 OAK GROVE RD, SUITE 200
WALNUT CREEK, CA 94598
Contra Costa County (925) 296-7150
CHRISTOPHER C LEE MD
Radiology (Vascular & Interventional Radiology)
2125 OAK GROVE RD, #200
WALNUT CREEK, CA 94598
Contra Costa County (925) 296-7150
SUNIL GANDHI M.D.
Radiology (Diagnostic Radiology)
2125 OAK GROVE RD, SUITE 200
WALNUT CREEK, CA 94598
Contra Costa County (925) 296-7150
DR. RALPH WESLEY MUTCHLER M.D.
Radiology (Diagnostic Radiology)
2125 OAK GROVE RD, #200
WALNUT CREEK, CA 94598
Contra Costa County (925) 296-7150
DR. SANGEETA GAMBHIR M.D.
Radiology (Diagnostic Radiology)
2125 OAK GROVE RD, #200
WALNUT CREEK, CA 94598
Contra Costa County (925) 296-7150

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 Less Chafen's NPI number?

The NPI number for Less Chafen is 1336131689. It was assigned to this individual provider in the NPPES registry on August 22, 2005.

Where is Less Chafen located?

Less Chafen practices at 2125 Oak Grove Rd #200, Walnut Creek, CA 94598. The listed phone number is (925) 296-7150.

What is Less Chafen's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Is Less Chafen enrolled in Medicare?

Yes. Less Chafen is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Less Chafen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Less Chafen reassigns Medicare benefits to Bay Imaging Consultants Medical Group Inc (Walnut Creek, 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 Less Chafen'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 Less Chafen was last updated on April 2, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.