What is Ling Xu's NPI number?

Ling Xu's National Provider Identifier (NPI) is 1073684429, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Ling Xu's specialty?

Ling Xu is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).

Where is Ling Xu located?

Ling Xu's practice location on file with NPPES is 20642 John Dr, Castro Valley, CA 94546-5103.

What is Ling Xu's phone number?

The practice phone number listed in the NPPES registry for Ling Xu is (510) 785-5000.

Does Ling Xu accept Medicare?

Ling Xu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is Ling Xu's NPI active?

Yes — Ling Xu's NPI (1073684429) is active in the NPPES registry as of the last update on 2024-04-24.

IndividualActiveAccepts Medicare

Ling Xu, M.D.

NPI 1073684429 · Internal Medicine Physician · Castro Valley, CA

Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Ling Xu, M.D. is a Internal Medicine Physician provider in Castro Valley, CA (NPI 1073684429).

Provider details

NPI number: 1073684429
Entity type: Individual
Primary specialty: Internal Medicine PhysicianAllopathic & Osteopathic Physicians
Credential: M.D.
Sex: Female
Sole proprietor: No
License: A69273 (CA)

Specialties & taxonomies

Internal Medicine PhysicianPrimary207R00000XLicense A69273 (CA)
Allopathic & Osteopathic Physicians

Profile Score

Detailed profile(87/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure28% of score
19 yrs in NPPES registry
Profile completeness28% of score
100% of core fields populated
Practice footprint17% of score
3 documented practice locations
Medicare service volume (vs. specialty peers)28% of score
1,372 Medicare services, 2024 (ranked within specialty)

Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

What this provider does (Medicare)

Based on Medicare fee-for-service claims, 2024; not all care is captured.

Service (HCPCS)	Medicare services	Typical Medicare-allowed (2024)
Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211	462	$19
Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214	388	$153
Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213	200	$109
Administration of Influenza Virus VaccineG0008	72	$38
Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439	70	$153
Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More

What this provider prescribes (Medicare Part D)

Top drugs by Medicare Part D claim volume, 2024 · 63 distinct drugs on file.

Drug	Part D claims (2024)	Beneficiaries
Amlodipine Besylate	256	102
Atorvastatin Calcium	217	87
Levothyroxine Sodium	186	60
Losartan Potassium	156	66
Metformin Hcl	130	52
Lisinopril	99	45
Furosemide	92

Practice location

20642 John Dr

Castro Valley, CA 94546-5103

Phone: (510) 785-5000

Fax: (510) 785-5295

Street-level locationGet directions

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Mailing address