DR. BENJAMIN YIM M.D.
NPI 1598176604
Neurological Surgery in Walnut Creek, CA

Q: What is Benjamin Yim's NPI number?

The NPI number for Benjamin Yim is 1598176604. It was assigned to this individual provider in the NPPES registry on May 12, 2014.

Q: What is Benjamin Yim's specialty?

The primary specialty registered for this NPI is Neurological Surgery with taxonomy code 207T00000X.

Q: When was this NPI record last updated?

The NPPES record for Benjamin Yim was last updated on May 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.

Active since May 12, 2014PECOS Enrolled

80.36/100

CMS Quality Rating

120 LA CASA VIA STE 102, WALNUT CREEK, CA 94598(925) 867-1900 Get Directions Write a Review

NPPES record last updated: May 1, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Feb 10, 2025, Jul 1, 2021, Jul 12, 2017 (3 updates tracked since 2017).

On this page

About Dr. Benjamin Yim M.d. NPPES

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

DR. BENJAMIN YIM M.D. (NPI 1598176604) is an individual neurological surgery provider in Walnut Creek, California, licensed in California (A143498) and active in the NPI registry since May 2014. He is enrolled in Medicare PECOS and is a graduate of Albany Medical College Of Union University (2014).

NPPES Registry Identity

NPI1598176604

Entity TypeIndividualMale

Primary Taxonomy207T00000X

Provider Legal NameDR. BENJAMIN YIMCredential: M.D.

Location Address120 LA CASA VIA STE 102Walnut Creek, CA 94598-3092

Mailing Address130 La Casa Via Ste 210Walnut Creek, CA 94598-3035 · (925) 309-5155

Phone(925) 867-1900

Sole ProprietorNo

Medical School CMSAlbany Medical College Of Union UniversityGraduated 2014

Enumeration DateMay 12, 2014

Last NPPES UpdateMay 1, 20253 updates tracked since enumeration

NPPES CertifiedMay 1, 2025

✔ NPI 1598176604 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNeurological SurgeryAllopathic & Osteopathic Physicians

Taxonomy Code207T00000X

License✔ Licensed in CA · A143498

Definition

A neurological surgeon provides the operative and non-operative management (i.e., prevention, diagnosis, evaluation, treatment, critical care, and rehabilitation) of disorders of the central, peripheral, and autonomic nervous systems, including their supporting structures and vascular supply; the evaluation and treatment of pathological processes which modify function or activity of the nervous system; and the operative and non-operative management of pain. A neurological surgeon treats patients with disorders of the nervous system; disorders of the brain, meninges, skull, and their blood supply, including the extracranial carotid and vertebral arteries; disorders of the pituitary gland; disorders of the spinal cord, meninges, and vertebral column, including those which may require treatment by spinal fusion or instrumentation; and disorders of the cranial and spinal nerves throughout their distribution.

120 LA CASA VIA STE 102, Walnut Creek, CA 94598

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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 (PECOS)

Dr. Benjamin Yim M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID8426388232

PECOS Enrollment IDI20210622003108

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

Medicare enrollment records show Benjamin Yim reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Benjamin Yim MD Apc

Same address

Neurological Surgery

120 LA CASA VIA STE 102
Walnut Creek, CA 94598

Reassigned Medicare billing, California enrollment

NPI 1922818111 (925) 867-1900

Maxwell B. Merkow MD, A Medical Corporation

Same address

Neurological Surgery

130 LA CASA VIA BLDG 2#110
Walnut Creek, CA 94598

Reassigned Medicare billing, California enrollment
3 clinicians in this Medicare group

NPI 1598290769 (925) 309-5155

John Muir Trauma Physicians Billing Service

0.2 mi

Hospitalist

1601 YGNACIO VALLEY RD
Walnut Creek, CA 94598

Reassigned Medicare billing, California enrollment
810 clinicians in this Medicare group

NPI 1093864837 (925) 947-5331

Bass Medical Group

1.3 mi

Orthopaedic Surgery

390 N WIGET LN STE 100
Walnut Creek, CA 94598

Reassigned Medicare billing, California enrollment
347 clinicians in this Medicare group

NPI 1043616600 (925) 944-0110

Contra Costa County

4.1 mi

Adult Mental Health

1420 WILLOW PASS RD
Concord, CA 94520

Reassigned Medicare billing, California enrollment
530 clinicians in this Medicare group

NPI 1023188489 (925) 646-5480

Northbay Health Medical Foundation

22 mi

Internal Medicine

4500 BUSINESS CENTER DR
Fairfield, CA 94534

Reassigned Medicare billing, California enrollment
225 clinicians in this Medicare group

NPI 1760283527 (707) 646-3110

Northbay Healthcare Group

24 mi

General Acute Care Hospital

1200 B GALE WILSON BLVD
Fairfield, CA 94533

Reassigned Medicare billing, California enrollment
Medicare enrollment name: Northbay Physicians Surgery Center, LLC
516 clinicians in this Medicare group

NPI 1821147786 (707) 646-5000

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 18

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 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.

126 services102 patients

Ultrasonic guidance for blood vessel access 76937

Ultrasonic guidance for blood vessel access is a medical procedure where sound waves are used to create images of your blood vessels. This helps doctors to accurately locate and access the vessels for treatments or tests, ensuring safety and precision.

95 services83 patients

Imaging of blood vessel 75898

Imaging of blood vessels, also known as vascular imaging, is a non-invasive procedure that allows doctors to view the condition of your blood vessels. It employs techniques like ultrasound, CT scan, or MRI to capture images, enabling the detection of blockages or abnormalities.

82 services43 patients

Review by radiologist of image for insertion of material to block blood flow 75894

This procedure involves a radiologist examining an image to plan the placement of a substance that will block blood flow in a specific area. This is usually done to prevent bleeding or to cut off the blood supply to a growth.

77 services44 patients

Insertion of tube into intracranial artery for diagnosis or treatment with review by radiologist 36223

This procedure involves placing a tube into an artery in the brain. It's typically done for diagnostic purposes or treatment. A radiologist, a doctor specializing in imaging, reviews the process to ensure accuracy and safety.

72 services70 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.

63 services55 patients

Occlusion of central nervous system or spinal cord artery 61624

This procedure involves blocking a central nervous system or spinal cord artery to prevent blood flow. It's typically done to treat conditions like aneurysms or vascular malformations. It can help prevent strokes, bleeding, or other serious issues.

51 services42 patients

Telephone medical discussion with physician, 11-20 minutes 99442

This is a service where you have a phone conversation with your doctor for 11-20 minutes. It's used for discussing health concerns, reviewing test results, or managing ongoing conditions. It's a convenient way to receive medical advice without an in-person visit.

47 services39 patients

Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes 99152

This procedure involves a doctor administering a medication to reduce your consciousness during a procedure. This helps in managing discomfort and anxiety. The initial application lasts for 15 minutes and is for individuals aged 5 years or older.

43 services41 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

40 services40 patients

Insertion of tube into internal neck artery for diagnosis or treatment with review by radiologist 36224

This procedure involves placing a small tube into your neck artery. It helps diagnose or treat certain conditions. A radiologist, a doctor specializing in medical imaging, reviews the process to ensure accuracy and safety.

33 services25 patients

Insertion of tube into brain artery for diagnosis or treatment with review by radiologist 36226

This procedure involves inserting a thin tube into a brain artery. It aids in diagnosing or treating brain conditions. A radiologist reviews the process to ensure accuracy and safety. It's a critical step in managing brain health effectively.

32 services32 patients

3d radiographic procedure with computerized image postprocessing 76377

A 3D radiographic procedure with computerized image postprocessing is a high-tech imaging test. It uses X-rays to create detailed 3D images of the body. The computerized postprocessing further enhances these images for more precise diagnosis and treatment planning.

31 services23 patients

Insertion of tube into external neck artery for diagnosis or treatment with review by radiologist 36227

This procedure involves placing a small tube into an artery in your neck. This is done to diagnose or treat certain conditions. A radiologist, a doctor who specializes in medical imaging, will review the procedure to ensure everything is done correctly.

29 services28 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

16 services16 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

15 services15 patients

Removal of blood clot and injection to dissolve blood clot from head artery using fluoroscopic guidance 61645

This procedure involves removing a blood clot from a head artery. A special imaging technique called fluoroscopy is used for guidance. Additionally, an injection is given to help dissolve any remaining clot. This helps restore normal blood flow to the brain.

12 services12 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

11 services11 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

$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

$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.

80.36/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

72.85

Improvement Activities

Cost

55.1

Other Providers at the Same Location NPPES 4

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. ELLIOT THOMAS MIN MD

Neurological Surgery

120 LA CASA VIA STE 102
WALNUT CREEK, CA 94598

Contra Costa County (925) 867-1900

MARK KLEBANOV MD CORP

Internal Medicine (Endocrinology, Diabetes & Metabolism)

120 LA CASA VIA STE 102
WALNUT CREEK, CA 94598

Contra Costa County (925) 296-0344

DR. MARK KLEBANOV M.D.

Internal Medicine (Endocrinology, Diabetes & Metabolism)

120 LA CASA VIA STE 102
WALNUT CREEK, CA 94598

Contra Costa County (925) 296-0344

BENJAMIN YIM MD APC

Neurological Surgery

120 LA CASA VIA STE 102
WALNUT CREEK, CA 94598

Contra Costa County (925) 867-1900

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 Benjamin Yim's NPI number?

The NPI number for Benjamin Yim is 1598176604. It was assigned to this individual provider in the NPPES registry on May 12, 2014.

Where is Benjamin Yim located?

Benjamin Yim practices at 120 La Casa Via Ste 102, Walnut Creek, CA 94598. The listed phone number is (925) 867-1900.

What is Benjamin Yim's specialty?

The primary specialty registered for this NPI is Neurological Surgery with taxonomy code 207T00000X.

Is Benjamin Yim enrolled in Medicare?

Yes. Benjamin Yim is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Benjamin Yim's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Benjamin Yim reassigns Medicare benefits to 7 organizations: Benjamin Yim MD Apc (Walnut Creek, CA), Maxwell B. Merkow MD, A Medical Corporation (Walnut Creek, CA), John Muir Trauma Physicians Billing Service (Walnut Creek, CA), Bass Medical Group (Walnut Creek, CA), Contra Costa County (Concord, CA) and 2 more organizations, listed in the Medicare section above. 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 Benjamin Yim'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 Benjamin Yim was last updated on May 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.