Homan Siman, MD
NPI 1558456814 · Internal Medicine Physician · Wilmington, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Homan Siman, MD is a Internal Medicine Physician provider in Wilmington, CA (NPI 1558456814).
Provider details
- NPI number
- 1558456814
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A83240 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 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
423 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 130 | $9 |
| Office Or Other Outpatient Visit for the Evaluation and Management of Established Patient That May Not Require Presence of Healthcare Professional99211 | 117 | $26 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 63 | $134 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 44 | $94 |
| Face-To-Face Behavioral Counseling for Obesity, 15 MinutesG0447 | 37 | $26 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 57 | 20 |
| Metformin Hcl | 25 | — |
| Amlodipine Besylate | 20 | — |
| Omeprazole | 16 | — |
| Levothyroxine Sodium | 15 | — |
| Losartan Potassium | 14 | — |
| Montelukast Sodium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$321 across 13 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
- 2006-10-04
- Last updated
- 2013-04-01
Frequently asked questions
- What is Homan Siman's NPI number?
- Homan Siman's National Provider Identifier (NPI) is 1558456814, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Homan Siman's specialty?
- Homan Siman is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Homan Siman located?
- Homan Siman's practice location on file with NPPES is 1231 Avalon Blvd, Wilmington, CA 90744.
- What is Homan Siman's phone number?
- The practice phone number listed in the NPPES registry for Homan Siman is (310) 835-7215.
- Does Homan Siman accept Medicare?
- Homan Siman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Homan Siman's NPI active?
- Yes — Homan Siman's NPI (1558456814) is active in the NPPES registry as of the last update on 2013-04-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.