LING XU (M.D.) – Internal Medicine Physician, NPI 1073684429
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
21,558 INTERNAL MEDICINE in CA
Provider Addresses for LING XU (M.D.)
20130 Lake Chabot Rd
Suite #307
Castro Valley, CA 945465340
Phone: (510) 690-9360
Fax: (510) 690-0346
Type: Location
9615 Crosby Dr
Pleasanton, CA 945884613
Phone: (510) 690-9360
Fax: (510) 690-0346
Type: Location
20642 JOHN DR
CASTRO VALLEY, CA 945465103
Phone: (510) 785-5000
Fax: (510) 785-5295
Type: Mailing
Lake Chabot Road, Castro Valley, Alameda County, California, 94546, United States
SUITE #307
CASTRO VALLEY, CA 945465340
Phone: (510) 690-9360
Fax: (510) 690-0346
Type: Location
9615, Crosby Drive, Pleasanton, Alameda County, California, United States
PLEASANTON, CA 945884613
Phone: (510) 690-9360
Fax: (510) 690-0346
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2004-03-25
PECOS data refreshed: 2026-06-15
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20040325000243 | I | Internal Medicine | CA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 342 | 226 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 157 | 130 | $0 |
| G0439 | Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 86 | 86 | $0 |
| 90677 | Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use | 56 | 56 | $0 |
| G0009 | Administration of pneumococcal vaccine | 56 | 56 | $0 |
Insurance plans in this area (ZIP 94546)
Loading plans...
Group practice members
| Name | Specialty | State |
|---|---|---|
| - | CA | |
| - | CA | |
| - | CA | |
| E N D O C R I N O L O G Y | CA | |
| - | CA | |
| Family Practice | CA | |
| - | CA | |
| - | CA | |
| - | CA | |
| - | CA |
Reviews
All reviews are moderated before publication. Reviews reflect users' opinions; we do not verify the accuracy of individual reviews.
No reviews yet. Be the first to share your experience — your opinion helps families compare providers.