DR. ANNE AN-RU CHEN (M.D.) – Internal Medicine Physician, NPI 1003852708
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
21,508 INTERNAL MEDICINE in CA
Provider Addresses for DR. ANNE AN-RU CHEN (M.D.)
1127 Texas St
Suite A
Fairfield, CA 945335745
Phone: (707) 426-6060
Type: Location
1127, West Texas Street, Fairfield, Solano County, California, 94533, United States
SUITE A
FAIRFIELD, CA 945335745
Phone: (707) 426-6060
Type: Location
669, Hillside Drive, Hillside, Fairfield, Solano County, California, 94533, United States
FAIRFIELD, CA 945331350
Phone: (707) 426-6336
Type: Mailing
PO BOX 255228
SACRAMENTO, CA 958655228
Phone:
Type: Mailing
770 MASON ST
VACAVILLE, CA 956884646
Phone: (707) 427-4900
Fax: (707) 454-5911
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
CMS reports 4 Open Payments records for all available years, with a total value of $66.
Total Amount is formed as General ($66) + Research ($0) + Ownership ($0) = $66.
Last reported payment date: 2023-10-10 • Largest payer in this snapshot: Novo Nordisk Inc ($50).
Total Amount
$66
General + Research + Ownership
Payments
4
Total payment records
General Amount
$66
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-10-10
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Novo Nordisk Inc | $50 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $15 |
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: 2003-11-20
PECOS data refreshed: 2026-05-27
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 |
|---|---|---|---|---|
| I20031120001022 | 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 | 244 | 160 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 43 | 36 | $0 |
| 99441 | Telephone medical discussion with physician, 5-10 minutes | 37 | 28 | $0 |
| 99442 | Telephone medical discussion with physician, 11-20 minutes | 36 | 29 | $0 |
| 99203 | New patient office or other outpatient visit, 30-44 minutes | 27 | 27 | $0 |
Insurance plans in this area (ZIP 94533)
Loading plans...
Group practice members
| Name | Specialty | State |
|---|---|---|
| Diagnostic Radiology | CA | |
| Diagnostic Radiology | CA | |
| - | CA | |
| Family Practice | CA | |
| - | CA | |
| - | CA | |
| Family Practice, General Practice | CA | |
| Allergy/Immunology, Rheumatology | CA | |
| Physician Assistant | CA | |
| Physician Assistant | 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.