ARIEL PALANCA M.D.
NPI 1629203971
Orthopaedic Surgery in Stanford, CA

Q: What is Ariel Palanca's NPI number?

The NPI number for Ariel Palanca is 1629203971. It was assigned to this individual provider in the NPPES registry on May 15, 2009.

Q: What is Ariel Palanca's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.

Q: When was this NPI record last updated?

The NPPES record for Ariel Palanca was last updated on September 28, 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.

Active since May 15, 2009PECOS EnrolledAccepts Medicare Assignment

80.15/100

CMS Quality Rating

300 PASTEUR DRIVE, STANFORD HOSPITAL & CLINICS, STANFORD, CA 94305(650) 721-7638 Get Directions Write a Review

NPPES record last updated: September 28, 2015. Verified against the NPPES registry weekly; last sync: October 18, 2026.

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About Ariel Palanca M.d. NPPES

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

ARIEL PALANCA M.D. (NPI 1629203971) is an individual orthopaedic surgery provider in Stanford, California, licensed in California (A114257) and active in the NPI registry since May 2009. She is enrolled in Medicare PECOS and is a graduate of University Of Michigan Medical School (2004).

NPPES Registry Identity

NPI1629203971

Entity TypeIndividualFemale

Primary Taxonomy207X00000X

Provider Legal NameARIEL PALANCACredential: M.D.

Location Address300 PASTEUR DRIVE, STANFORD HOSPITAL & CLINICSStanford, CA 94305

Mailing Address300 Pasteur DrStanford, CA 94305-2200 · (650) 723-4000

Phone(650) 721-7638

Sole ProprietorNo

Medical School CMSUniversity Of Michigan Medical SchoolGraduated 2004

Enumeration DateMay 15, 2009

Last NPPES UpdateSeptember 28, 2015

✔ NPI 1629203971 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOrthopaedic SurgeryAllopathic & Osteopathic Physicians

Taxonomy Code207X00000X

License✔ Licensed in CA · A114257

Definition

An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system.

300 PASTEUR DRIVE, Stanford, CA 94305

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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

Ariel Palanca M.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 ID9931423696

PECOS Enrollment IDI20150128002198

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 Ariel Palanca reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

County Of Santa Clara

2.0 mi

Mental Health (Including Community Mental Health Center)

231 GRANT AVENUE
Palo Alto, CA 94306

Reassigned Medicare billing, California enrollment
2,460 clinicians in this Medicare group

NPI 1144330614 (650) 321-5545

Arch Health Partners

406 mi

Surgery

2385 S MELROSE DR
Vista, CA 92081

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

NPI 1780222968 (760) 845-2863

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 15

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.

X-ray of foot, minimum of 3 views 73630

An X-ray of the foot, minimum of 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the bones and tissues in your foot. This helps to identify fractures, infections, or other abnormalities. Multiple views ensure a comprehensive examination.

321 services210 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.

288 services205 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.

259 services172 patients

X-ray of ankle, minimum of 3 views 73610

An ankle X-ray is a quick, painless imaging test. It involves capturing at least three different images or 'views' of your ankle using small amounts of radiation. These images help identify any abnormalities or injuries, such as fractures or arthritis.

166 services122 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.

94 services94 patients

Aspiration and/or injection of fluid from small joint 20600

This procedure involves inserting a thin needle into a small joint to remove (aspirate) or inject fluid. It can help diagnose conditions, relieve discomfort, or administer medication directly into the joint. It's generally safe with minimal discomfort.

50 services36 patients

Placement of strapping to ankle or foot 29540

Strapping to the ankle or foot is a procedure involving the application of tape or a similar material to provide support and stability. It can help manage injuries, reduce pain, and prevent further harm. The process is non-invasive and typically performed by a trained professional.

46 services32 patients

Correction of toe joint deformity 28285

Correction of toe joint deformity is a procedure to fix misshapen toe joints. This can involve realigning the bones, removing bone or tissue, or implanting devices to improve joint function. It can help reduce pain and improve mobility.

43 services17 patients

Aspiration and/or injection of fluid from medium joint 20605

This procedure involves a needle being inserted into a medium-sized joint, such as a knee or shoulder, to remove (aspirate) excess fluid. Sometimes, medication may also be injected into the joint to reduce inflammation and pain.

37 services29 patients

Injection, methylprednisolone acetate, 40 mg J1030

Methylprednisolone acetate is a medication given through an injection. It's a type of corticosteroid, which reduces inflammation and immune responses. It can be used to treat various conditions like arthritis, allergies, and skin diseases. This dose is 40 mg.

33 services24 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.

27 services27 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.

18 services17 patients

X-ray of hip, 2-3 views 73502

An X-ray of the hip with 2-3 views is a non-invasive imaging test. It uses a small amount of radiation to produce pictures of the hip joint. These images help in diagnosing conditions like fractures, arthritis, or other abnormalities. The process is quick and painless.

17 services11 patients

Injection into tendon or ligament 20550

An injection into a tendon or ligament involves placing medication directly into these areas to help reduce inflammation and pain. It's often used for conditions like arthritis or tendonitis. The procedure is quick and usually involves a local anesthetic.

14 services12 patients

Fusion of big toe at joint with foot 28750

Fusion of the big toe at the joint with the foot, also known as arthrodesis, is a surgical procedure aimed at relieving pain and improving stability. It involves permanently connecting the bones of the big toe and foot, which can limit movement but often enhances comfort and function.

11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94305 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

$106.47 typical visit price

range $70.37 – $206.04

Typical copayment $26.61 (range $17.59 – $51.51)

Most-billed visit code 99203

Established Patient

$86.56 typical visit price

range $23.96 – $169.60

Typical copayment $21.64 (range $5.99 – $42.40)

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.

80.15/100

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

Scored through an Alternative Payment Model

Quality

69.01

Promoting Interoperability

Improvement Activities

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Ankle orthosis, ankle gauntlet or similar, with or without joints, prefabricated, off-the-shelf L1902

DME-Orthotic Devices · category DF003N

1 supplier11 claims11 services$71.13 avg. paid by Medicare

Walking boot, pneumatic and/or vacuum, with or without joints, with or without interface material, prefabricated, off-the-shelf L4361

DME-Orthotic Devices · category DF003N

1 supplier45 claims45 services$245.90 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

ANDREA LORENZE M.D.

Hospitalist

300 PASTEUR DRIVE, LANE 154
STANFORD, CA 94305

Santa Clara County (650) 723-6661

MARTINA LEFTEROVA M.D., PH.D.

Pathology (Clinical Pathology/Laboratory Medicine)

300 PASTEUR DRIVE, LANE 235
STANFORD, CA 94305

Santa Clara County (650) 725-8383

DR. JEFFREY XING MD, PHD

Radiology (Diagnostic Radiology)

300 PASTEUR DRIVE, H1330, MC: 5621
STANFORD, CA 94305

Santa Clara County (650) 723-7816

DR. MICHAEL B FOWLER MB, FRCP

Internal Medicine (Cardiovascular Disease)

300 PASTEUR DRIVE, FALK CVRC 295
STANFORD, CA 94305

Santa Clara County (650) 723-7846

ARIAN MANSUR

Student in an Organized Health Care Education/Training Program

300 PASTEUR DRIVE
STANFORD, CA 94305

Santa Clara County (650) 723-5948

ERIK WILLIAM NOHR MD

Pathology (Molecular Genetic Pathology)

300 PASTEUR DRIVE, ROOM L235, MC:5324
STANFORD, CA 94305

Santa Clara County (650) 723-5252

DR. SAMUEL J. S. RUBIN PHD, MD

Student in an Organized Health Care Education/Training Program

300 PASTEUR DRIVE, LANE 154
STANFORD, CA 94305

Santa Clara County (650) 723-6661

ALAN LYNN RINGOLD MD

Psychiatry & Neurology (Psychiatry)

300 PASTEUR DRIVE
STANFORD, CA 94305

Santa Clara County (650) 723-4000

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 Ariel Palanca's NPI number?

The NPI number for Ariel Palanca is 1629203971. It was assigned to this individual provider in the NPPES registry on May 15, 2009.

Where is Ariel Palanca located?

Ariel Palanca practices at 300 Pasteur Drive Stanford Hospital & Clinics, Stanford, CA 94305. The listed phone number is (650) 721-7638.

What is Ariel Palanca's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.

Is Ariel Palanca enrolled in Medicare?

Yes. Ariel Palanca 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 Ariel Palanca's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ariel Palanca reassigns Medicare benefits to 2 organizations: County Of Santa Clara (Palo Alto, CA) and Arch Health Partners (Vista, 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 Ariel Palanca'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 Ariel Palanca was last updated on September 28, 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.