Mark Mass, MD
NPI 1841276847 · Urgent Care Clinic/Center · Lake Forest, IL
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Mass, MD is a Urgent Care Clinic/Center provider in Lake Forest, IL (NPI 1841276847).
Provider details
- NPI number
- 1841276847
- Entity type
- Individual
- Primary specialty
- Urgent Care Clinic/CenterAmbulatory Health Care Facilities
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 36093222 (IL)
Specialties & taxonomies
Ambulatory Health Care Facilities
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Ambulatory Health Care Facilities
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,579 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 444 | $136 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 208 | $96 |
| Detection Test By Immunoassay Technique for Severe Acute Respiratory Syndrome Coronavirus and Influenza87428 | 162 | $69 |
| X-Ray of Chest, 2 Views71046 | 108 | $36 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 107 | $178 |
| Automated Urinalysis Test81003 | 88 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 14 | — |
| Clarithromycin | 11 | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-12-21
- Last updated
- 2014-04-23
Frequently asked questions
- What is Mark Mass's NPI number?
- Mark Mass's National Provider Identifier (NPI) is 1841276847, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Mass's specialty?
- Mark Mass is listed in the NPPES registry with a primary specialty of Urgent Care Clinic/Center (Ambulatory Health Care Facilities).
- Where is Mark Mass located?
- Mark Mass's practice location on file with NPPES is 1025 W Everett Rd, Lake Forest, IL 60045-2697.
- What is Mark Mass's phone number?
- The practice phone number listed in the NPPES registry for Mark Mass is (847) 234-7950.
- Does Mark Mass accept Medicare?
- Mark Mass is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Mass's NPI active?
- Yes — Mark Mass's NPI (1841276847) is active in the NPPES registry as of the last update on 2014-04-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.