Mark Wylam, M.D.
NPI 1003880865 · Critical Care Medicine (Internal Medicine) Physician · Orange, CA
Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Wylam, M.D. is a Critical Care Medicine (Internal Medicine) Physician provider in Orange, CA (NPI 1003880865).
Provider details
- NPI number
- 1003880865
- Entity type
- Individual
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 197177 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
334 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 35 Minutes99232 | 85 | $80 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 61 | $125 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 50 | $49 |
| Critical Care, First 30-74 Minutes99291 | 43 | $219 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 33 | $118 |
| Test to Examine How Well the Lungs Exchange Gases94729 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 42 | — |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 27 | 11 |
| Prednisone | 26 | — |
| Itraconazole | 21 | — |
| Elexacaftor/Tezacaftor/Ivacaftbrand: Trikafta | 20 | — |
| Rosuvastatin Calcium | 20 | — |
| Valganciclovir Hcl | 19 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$500 across 1 record (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
Additional practice locations (1)
- 200 1st St SwRochester, MN 55905-0001Phone: (507) 284-2511
Registry dates
- Enumerated
- 2006-02-16
- Last updated
- 2025-10-27
- Certified
- 2025-10-27
Frequently asked questions
- What is Mark Wylam's NPI number?
- Mark Wylam's National Provider Identifier (NPI) is 1003880865, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Wylam's specialty?
- Mark Wylam is listed in the NPPES registry with a primary specialty of Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Wylam located?
- Mark Wylam's practice location on file with NPPES is 101 the City Dr S, Orange, CA 92868-3201.
- What is Mark Wylam's phone number?
- The practice phone number listed in the NPPES registry for Mark Wylam is (714) 456-7890.
- Does Mark Wylam accept Medicare?
- Mark Wylam is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Wylam's NPI active?
- Yes — Mark Wylam's NPI (1003880865) is active in the NPPES registry as of the last update on 2025-10-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.