Huan Guu, M.D.
NPI 1952352668 · Internal Medicine Physician · Mission Viejo, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Huan Guu, M.D. is a Internal Medicine Physician provider in Mission Viejo, CA (NPI 1952352668).
Provider details
- NPI number
- 1952352668
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A62481 (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
20 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
5,224 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) |
|---|---|---|
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 3,295 | $121 |
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 1,159 | $82 |
| Initial Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, 50 Minutes Or More99306 | 303 | $203 |
| Advance Care Planning, First 30 Minutes99497 | 302 | $83 |
| Nursing Facility Discharge Management, More Than 30 Minutes99316 | 151 | $146 |
| Subsequent Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, at Least 45 Minutes99310 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 172 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 589 | 127 |
| Amlodipine Besylate | 495 | 102 |
| Apixabanbrand: Eliquis | 471 | 57 |
| Levothyroxine Sodium | 430 | 90 |
| Gabapentin | 407 | 87 |
| Furosemide | 236 | 66 |
| Pantoprazole Sodium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-15
- Last updated
- 2007-07-08
Frequently asked questions
- What is Huan Guu's NPI number?
- Huan Guu's National Provider Identifier (NPI) is 1952352668, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Huan Guu's specialty?
- Huan Guu is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Huan Guu located?
- Huan Guu's practice location on file with NPPES is 27700 Medical Center Rd, Mission Viejo, CA 92691-6426.
- What is Huan Guu's phone number?
- The practice phone number listed in the NPPES registry for Huan Guu is (949) 364-1400.
- Does Huan Guu accept Medicare?
- Huan Guu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Huan Guu's NPI active?
- Yes — Huan Guu's NPI (1952352668) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.