DR. HENRY JACK GRAINGER DO
NPI 1306892005
Internal Medicine in Houston, TX
About Dr. Henry Jack Grainger Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. HENRY JACK GRAINGER DO (NPI 1306892005) is an individual internal medicine provider in Houston, Texas, licensed in Texas (E1595) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1973).
NPPES Registry Identity
Specialties & Licenses 3
Other Identifiers 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Henry Jack Grainger Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Henry Grainger reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Houston, TX 77091
- Reassigned Medicare billing, Texas enrollment
Jersey Village, TX 77040
- Reassigned Medicare billing, Texas enrollment
Houston, TX 77090
- Reassigned Medicare billing, Texas enrollment
- 32 clinicians in this Medicare group
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 13
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 77091 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 3
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Henry Grainger's NPI number?
The NPI number for Henry Grainger is 1306892005. It was assigned to this individual provider in the NPPES registry on May 25, 2006.
Where is Henry Grainger located?
Henry Grainger practices at 511A W Tidwell Rd, Houston, TX 77091. The listed phone number is (713) 694-9709.
What is Henry Grainger's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Henry Grainger enrolled in Medicare?
Yes. Henry Grainger is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Henry Grainger's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Henry Grainger reassigns Medicare benefits to 3 organizations: Grainger Diagnostic Clinic, PA (Houston, TX), Grainger Medical Partners, PLLC (Jersey Village, TX) and 1960 Physician Associates (Houston, 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 Henry Grainger's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Henry Grainger accept?
Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 3 other insurers list Henry Grainger 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 Henry Grainger was last updated on April 12, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Dr. Henry Jack Grainger, DO · NPI 1306892005
Internal Medicine physician in Houston, Texas. Individual provider, active in the CMS NPPES registry since May 25, 2006.
## Identity
- **NPI:** 1306892005 (Entity type: Individual)
- **Enumerated:** May 25, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** E1595 (Texas)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 511A W TIDWELL RD, Houston, TX 77091-4338
- **Phone:** (713) 694-9709 · **Fax:** (281) 618-8761
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Grainger Diagnostic Clinic, PA (NPI 1710934419, Houston, TX); Grainger Medical Partners, PLLC (NPI 1720435688, Jersey Village, TX); 1960 Physician Associates (NPI 1215391941, Houston, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1973
## Record status
- **NPPES last updated:** April 12, 2021
- **Other identifiers:** Other 00R283 (TX); Medicaid 115814904 (TX)
---
Source: [NPI Profile](https://npiprofile.com/npi/1306892005) · Data from the CMS NPPES public registry.