Mark Wong, MD
NPI 1821054081 · Internal Medicine Physician · Phoenix, AZ
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Wong, MD is a Internal Medicine Physician provider in Phoenix, AZ (NPI 1821054081).
Provider details
- NPI number
- 1821054081
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 32916 (AZ)
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
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
462 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 | 176 | $116 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 163 | $140 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 79 | $154 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 28 | $95 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 16 | $168 |
Typical Medicare-allowed amounts for these services range $95–$168 (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 · 43 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tacrolimus | 311 | 73 |
| Mycophenolate Mofetil | 289 | 65 |
| Ursodiol | 240 | 56 |
| Tenofovir Alafenamidebrand: Vemlidy | 120 | 12 |
| Fluconazole | 81 | 26 |
| Entecavir | 74 | 14 |
| Prednisone | 74 | 34 |
| Carvedilol | 56 | 16 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$12,792 across 42 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
- 2006-04-25
- Last updated
- 2016-12-02
Frequently asked questions
- What is Mark Wong's NPI number?
- Mark Wong's National Provider Identifier (NPI) is 1821054081, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Wong's specialty?
- Mark Wong is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Wong located?
- Mark Wong's practice location on file with NPPES is 1441 N 12th St, Phoenix, AZ 85006-2837.
- What is Mark Wong's phone number?
- The practice phone number listed in the NPPES registry for Mark Wong is (602) 521-5800.
- Does Mark Wong accept Medicare?
- Mark Wong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Wong's NPI active?
- Yes — Mark Wong's NPI (1821054081) is active in the NPPES registry as of the last update on 2016-12-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.