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DR. LARRY A. GRISSOM M.D.
NPI 1164400644
Radiology - Diagnostic Radiology in Houston, TX

Active since January 05, 2006PECOS Enrolled
85.9/100
CMS Quality Rating
800 PEAKWOOD DR, SUITE 5E, HOUSTON, TX 77090(281) 440-5158(281) 440-8549 Get Directions Write a Review

NPPES record last updated: July 29, 2008. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Larry A. Grissom M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. LARRY A. GRISSOM M.D. (NPI 1164400644) is an individual diagnostic radiology provider in Houston, Texas, licensed in Texas (F1605) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1164400644
Entity TypeIndividualMale
Primary Taxonomy2085R0202X
Provider Legal NameDR. LARRY A. GRISSOMCredential: M.D.
Location Address800 PEAKWOOD DR, SUITE 5EHouston, TX 77090-2900
Mailing Address800 Peakwood Dr, Suite 5eHouston, TX 77090-2900 · (281) 440-5158 · Fax (281) 440-8549
Phone(281) 440-5158
Fax(281) 440-8549
Sole ProprietorNo
Enumeration DateJanuary 5, 2006
Last NPPES UpdateJuly 29, 2008
✔ NPI 1164400644 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians
Taxonomy Code2085R0202X
License✔ Licensed in TX · F1605
Definition
A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.
800 PEAKWOOD DR, Houston, TX 77090
Open in Google Maps ↗

Other Identifiers 3

Medicare UPINE12272TX
Medicare ID-Type Unspecified83R345TX · Individual M/c Provider #
Medicaid1253874-03TX

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Texas, Molina Healthcare.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Larry A. Grissom M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Larry Grissom reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Rose Imaging Specialists PA
0.3 mi
Diagnostic Ultrasound
17080 RED OAK DR
Houston, TX 77090
  • Reassigned Medicare billing, Texas enrollment
  • 75 clinicians in this Medicare group
NPI 1164478186 (281) 880-6991
Singleton Associates PA
10 mi
Diagnostic Radiology
9250 PINECROFT DR
Shenandoah, TX 77380
  • Reassigned Medicare billing, Texas enrollment
  • 1,278 clinicians in this Medicare group
NPI 1487811766 (936) 266-2000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 12

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Screening 3d breast mammography 77063
Screening 3D breast mammography is a procedure that uses low-dose X-rays to create detailed images of the breast. This allows for early detection of any unusual changes or growths. It's a non-invasive, outpatient procedure that typically takes about 30 minutes.
243 services243 patients
Screening mammography 77067
Screening mammography is a preventative measure that uses low-dose X-rays to take images of the chest area. It's a key tool in early detection of abnormalities, helping to identify issues before they become symptomatic. It is recommended annually for certain age groups.
243 services243 patients
Screening 3d breast mammography 77063
Screening 3D breast mammography is a procedure that uses low-dose X-rays to create detailed images of the breast. This allows for early detection of any unusual changes or growths. It's a non-invasive, outpatient procedure that typically takes about 30 minutes.
173 services173 patients
Screening mammography 77067
Screening mammography is a preventative measure that uses low-dose X-rays to take images of the chest area. It's a key tool in early detection of abnormalities, helping to identify issues before they become symptomatic. It is recommended annually for certain age groups.
173 services173 patients
Dxa bone density measurement of hip, pelvis, spine 77080
A DXA bone density measurement is a simple, quick, and non-invasive procedure that assesses the strength of your bones. This test uses X-rays to measure the amount of minerals, mainly calcium, in the hip, pelvis, and spine. It helps in early detection of osteoporosis or other bone diseases.
111 services111 patients
Dxa bone density measurement of hip, pelvis, spine 77080
A DXA bone density measurement is a simple, quick, and non-invasive procedure that assesses the strength of your bones. This test uses X-rays to measure the amount of minerals, mainly calcium, in the hip, pelvis, and spine. It helps in early detection of osteoporosis or other bone diseases.
56 services56 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 77090 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$90.40 typical visit price
range $58.24 – $176.98
Typical copayment $22.60 (range $14.56 – $44.24)
Most-billed visit code 99203
Established Patient
$72.62 typical visit price
range $18.60 – $143.93
Typical copayment $18.15 (range $4.65 – $35.98)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

85.9/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality80.66
Improvement Activities40

Reported Quality Measures

Radiation Consideration for Adult CT: Utilization of Dose Lowering Techniques
Percentage of final reports for patients aged 18 years and older undergoing CT with documentation that one or more of the following dose reduction techniques were used: - Automated exposure control - Adjustment of the mA and/or kV according to patient size -…
97%339 patients
Radiology: Reminder System for Screening Mammograms
Percentage of patients undergoing a screening mammogram whose information is entered into a reminder system with a target due date for the next mammogram
99%285 patients
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

WOODLANDS RHEUMATOLOGY CLINIC
Internal Medicine
800 PEAKWOOD DR, 6G
HOUSTON, TX 77090
Harris County (832) 286-1087
PREMIER INFECTIOUS DISEASE ASSOCIATES PA
Internal Medicine (Infectious Disease)
800 PEAKWOOD DR, SUITE 3A
HOUSTON, TX 77090
Harris County (281) 587-8777
DR. XIMENA MILLAN M.D.
Internal Medicine (Infectious Disease)
800 PEAKWOOD DR, SUITE 3A
HOUSTON, TX 77090
Harris County (281) 587-8777
DEVINDER BHATIA M.D.
Thoracic Surgery (Cardiothoracic Vascular Surgery)
800 PEAKWOOD DR, STE 4A
HOUSTON, TX 77090
Harris County (281) 397-7000
RAO INTERNAL MEDICINE ASSOCIATES, PLLC
Internal Medicine
800 PEAKWOOD DR, STE. 6G
HOUSTON, TX 77090
Harris County (281) 296-3362
BELLAIRE PULMONARY AND MEDICAL CLINIC
Internal Medicine
800 PEAKWOOD DR, SUITE 7H
HOUSTON, TX 77090
Harris County (713) 666-6364
DR. NEEHARIKA JULAPALLI DPM
Podiatrist (Primary Podiatric Medicine)
800 PEAKWOOD DR, STE 4E
HOUSTON, TX 77090
Harris County (318) 792-8033
MR. THOMAS P MCHUGH M.D.
Specialist
800 PEAKWOOD DR, STE 8C
HOUSTON, TX 77090
Harris County (281) 444-3733

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Larry Grissom's NPI number?

The NPI number for Larry Grissom is 1164400644. It was assigned to this individual provider in the NPPES registry on January 5, 2006.

Where is Larry Grissom located?

Larry Grissom practices at 800 Peakwood Dr Suite 5E, Houston, TX 77090. The listed phone number is (281) 440-5158.

What is Larry Grissom's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Is Larry Grissom enrolled in Medicare?

Yes. Larry Grissom is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Larry Grissom's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Larry Grissom reassigns Medicare benefits to 2 organizations: Rose Imaging Specialists PA (Houston, TX) and Singleton Associates PA (Shenandoah, TX). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Larry Grissom's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Larry Grissom accept?

Health plans from Blue Cross and Blue Shield of Texas and Molina Healthcare list Larry Grissom as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Larry Grissom was last updated on July 29, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.