Larry Grissom, M.D.
NPI 1164400644 · Diagnostic Radiology Physician · Houston, TX
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Larry Grissom, M.D. is a Diagnostic Radiology Physician provider in Houston, TX (NPI 1164400644).
Provider details
- NPI number
- 1164400644
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- F1605 (TX)
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
1,099 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) |
|---|---|---|
| Screening 3d Breast Mammography77063 | 243 | $28 |
| Screening Mammography77067 | 243 | $36 |
| Screening 3d Breast Mammography77063 | 173 | $51 |
| Screening Mammography77067 | 173 | $125 |
| Dxa Bone Density Measurement of Hip, Pelvis, Spine77080 | 111 | $9 |
| Dxa Bone Density Measurement of Hip, Pelvis, Spine77080 | 56 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-01-05
- Last updated
- 2008-07-29
Frequently asked questions
- What is Larry Grissom's NPI number?
- Larry Grissom's National Provider Identifier (NPI) is 1164400644, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Larry Grissom's specialty?
- Larry Grissom is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Larry Grissom located?
- Larry Grissom's practice location on file with NPPES is 800 Peakwood Dr, Houston, TX 77090-2900.
- What is Larry Grissom's phone number?
- The practice phone number listed in the NPPES registry for Larry Grissom is (281) 440-5158.
- Does Larry Grissom accept Medicare?
- Larry Grissom is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Larry Grissom's NPI active?
- Yes — Larry Grissom's NPI (1164400644) is active in the NPPES registry as of the last update on 2008-07-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.