Karen Michelle Guiang, D.O.
NPI 1871738344 · Infectious Disease Physician · Claremont, CA
Enrolled with Medicare as Practitioner - Infectious Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Michelle Guiang, D.O. is a Infectious Disease Physician provider in Claremont, CA (NPI 1871738344).
Provider details
- NPI number
- 1871738344
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Female
- Sole proprietor
- No
- License
- 20A10579 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
17 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
5,341 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 4,042 | $114 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 623 | $167 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 479 | $76 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, 1 Hour Or Less96365 | 153 | $69 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 44 | $134 |
Typical Medicare-allowed amounts for these services range $69–$167 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 21 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Vancomycin Hcl | 78 | 28 |
| Ceftriaxone Sodiumbrand: Ceftriaxone | 62 | 21 |
| Daptomycin | 52 | 15 |
| Ertapenem Sodiumbrand: Ertapenem | 44 | 28 |
| Cefepime Hcl | 44 | — |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 37 | 36 |
| Ampicillin Sod/Sulbactam Sodbrand: Ampicillin-Sulbactam | 26 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,052 across 54 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-12-11
- Last updated
- 2020-04-29
- Certified
- 2020-04-29
Frequently asked questions
- What is Karen Michelle Guiang's NPI number?
- Karen Michelle Guiang's National Provider Identifier (NPI) is 1871738344, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Michelle Guiang's specialty?
- Karen Michelle Guiang is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Michelle Guiang located?
- Karen Michelle Guiang's practice location on file with NPPES is 935 W Foothill Blvd, Claremont, CA 91711-3304.
- What is Karen Michelle Guiang's phone number?
- The practice phone number listed in the NPPES registry for Karen Michelle Guiang is (626) 851-8880.
- Does Karen Michelle Guiang accept Medicare?
- Karen Michelle Guiang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Michelle Guiang's NPI active?
- Yes — Karen Michelle Guiang's NPI (1871738344) is active in the NPPES registry as of the last update on 2020-04-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.