Mark Grinman, MD
NPI 1164489829 · Neurology Physician · Myrtle Beach, SC
Enrolled with Medicare as Practitioner - Neuropsychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Grinman, MD is a Neurology Physician provider in Myrtle Beach, SC (NPI 1164489829).
Provider details
- NPI number
- 1164489829
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 20455 (SC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
860 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 609 | $75 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 117 | $165 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 71 | $113 |
| Critical Care, First 30-74 Minutes99291 | 63 | $205 |
Typical Medicare-allowed amounts for these services range $75–$205 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-04-27
- Last updated
- 2022-01-28
- Certified
- 2020-02-24
Frequently asked questions
- What is Mark Grinman's NPI number?
- Mark Grinman's National Provider Identifier (NPI) is 1164489829, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Grinman's specialty?
- Mark Grinman is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Grinman located?
- Mark Grinman's practice location on file with NPPES is 920 Doug White Dr Ste 460, Myrtle Beach, SC 29572-4182.
- What is Mark Grinman's phone number?
- The practice phone number listed in the NPPES registry for Mark Grinman is (843) 449-2336.
- Does Mark Grinman accept Medicare?
- Mark Grinman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Grinman's NPI active?
- Yes — Mark Grinman's NPI (1164489829) is active in the NPPES registry as of the last update on 2022-01-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.