Grace Guo, MD
NPI 1902811375 · Internal Medicine Physician · Sunnyvale, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Grace Guo, MD is a Internal Medicine Physician provider in Sunnyvale, CA (NPI 1902811375).
Provider details
- NPI number
- 1902811375
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A64096 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
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
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
374 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 182 | $155 |
| 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 | 83 | $19 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 48 | $216 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 46 | $157 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 15 | $111 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 28 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 235 | 68 |
| Amlodipine Besylate | 156 | 44 |
| Alendronate Sodium | 82 | 23 |
| Losartan Potassium | 72 | 20 |
| Levothyroxine Sodium | 67 | 18 |
| Lisinopril | 62 | 17 |
| Metformin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-31
- Last updated
- 2011-12-01
Frequently asked questions
- What is Grace Guo's NPI number?
- Grace Guo's National Provider Identifier (NPI) is 1902811375, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Grace Guo's specialty?
- Grace Guo is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Grace Guo located?
- Grace Guo's practice location on file with NPPES is 401 Old San Francisco Rd, Sunnyvale, CA 94086-6387.
- What is Grace Guo's phone number?
- The practice phone number listed in the NPPES registry for Grace Guo is (408) 730-4360.
- Does Grace Guo accept Medicare?
- Grace Guo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Grace Guo's NPI active?
- Yes — Grace Guo's NPI (1902811375) is active in the NPPES registry as of the last update on 2011-12-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.