Rainier Guiang, M.D.
NPI 1548217821 · Pain Medicine (Anesthesiology) Physician · Riverside, CA
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Rainier Guiang, M.D. is a Pain Medicine (Anesthesiology) Physician provider in Riverside, CA (NPI 1548217821).
Provider details
- NPI number
- 1548217821
- Entity type
- Individual
- Primary specialty
- Pain Medicine (Anesthesiology) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A84296 (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
20 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
2,249 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 1,645 | $91 |
| Testing for Presence of Drug, Read By Direct Observation80305 | 215 | $12 |
| Injection of Substance Into Lower Spine Canal Using Imaging Guidance62323 | 196 | $276 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 46 | $175 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 40 | $135 |
| Injection of Substance Into Middle Or Upper Spine Canal Using Imaging Guidance |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 27 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 661 | 360 |
| Gabapentin | 530 | 173 |
| Tramadol Hcl | 296 | 122 |
| Methylprednisolone | 214 | 197 |
| Meloxicam | 193 | 59 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 163 | 82 |
| Pregabalin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$381 across 11 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
- 2006-05-30
- Last updated
- 2013-05-14
Frequently asked questions
- What is Rainier Guiang's NPI number?
- Rainier Guiang's National Provider Identifier (NPI) is 1548217821, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Rainier Guiang's specialty?
- Rainier Guiang is listed in the NPPES registry with a primary specialty of Pain Medicine (Anesthesiology) Physician (Allopathic & Osteopathic Physicians).
- Where is Rainier Guiang located?
- Rainier Guiang's practice location on file with NPPES is 6900 Brockton Ave, Riverside, CA 92506-3801.
- What is Rainier Guiang's phone number?
- The practice phone number listed in the NPPES registry for Rainier Guiang is (951) 784-7111.
- Does Rainier Guiang accept Medicare?
- Rainier Guiang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Rainier Guiang's NPI active?
- Yes — Rainier Guiang's NPI (1548217821) is active in the NPPES registry as of the last update on 2013-05-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.