CLARK TIMOTHY JOHNSON MD
NPI 1497989305
Obstetrics & Gynecology - Maternal & Fetal Medicine in Harrisburg, PA
About Clark Timothy Johnson Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CLARK TIMOTHY JOHNSON MD (NPI 1497989305) is an individual maternal & fetal medicine provider in Harrisburg, Pennsylvania, licensed in Pennsylvania (MD490154) and active in the NPI registry since May 2009. He is enrolled in Medicare PECOS and maintains a secondary practice location in Baltimore.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Clark Timothy Johnson Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
7Medicare enrollment records show Clark Johnson reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Harrisburg, PA 17101
- Reassigned Medicare billing, Pennsylvania enrollment
- 1,902 clinicians in this Medicare group
Lutherville, MD 21093
- Reassigned Medicare billing, Maryland enrollment
- 4,483 clinicians in this Medicare group
Eldersburg, MD 21784
- Reassigned Medicare billing, Maryland enrollment
- 664 clinicians in this Medicare group
Towson, MD 21204
- Reassigned Medicare billing, Maryland enrollment
- 501 clinicians in this Medicare group
Perryville, MD 21903
- Reassigned Medicare billing, Maryland enrollment
- 512 clinicians in this Medicare group
Williamsport, PA 17701
- Reassigned Medicare billing, Pennsylvania enrollment
- 31 clinicians in this Medicare group
Pasadena, MD 21122
- Reassigned Medicare billing, Maryland enrollment
- 794 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 17101 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
Other Providers at the Same Location NPPES 10
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
HARRISBURG, PA 17101
HARRISBURG, PA 17101
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 Clark Johnson's NPI number?
The NPI number for Clark Johnson is 1497989305. It was assigned to this individual provider in the NPPES registry on May 6, 2009.
Where is Clark Johnson located?
Clark Johnson practices at 100 S 2nd St Ste 4B, Harrisburg, PA 17101. The listed phone number is (717) 231-8472.
What is Clark Johnson's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Maternal & Fetal Medicine, with taxonomy code 207VM0101X.
Is Clark Johnson enrolled in Medicare?
Yes. Clark Johnson is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Clark Johnson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Clark Johnson reassigns Medicare benefits to 7 organizations: Pinnacle Health Medical Services (Harrisburg, PA), Johns Hopkins University (Lutherville, MD), Sinai Hospital Of Baltimore Inc (Eldersburg, MD), University Of Maryland St. Joseph Medical Group, LLC (Towson, MD), Union Hospital Of Cecil County, Inc (Perryville, MD) and 2 more organizations, listed in the Medicare section above. 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 Clark Johnson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Clark Johnson was last updated on July 7, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 months 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.
# Clark Timothy Johnson, MD · NPI 1497989305
Maternal & Fetal Medicine physician in Harrisburg, Pennsylvania. Individual provider, active in the CMS NPPES registry since May 6, 2009.
## Identity
- **NPI:** 1497989305 (Entity type: Individual)
- **Enumerated:** May 6, 2009
- **Primary specialty:** Obstetrics & Gynecology - Maternal & Fetal Medicine · taxonomy 207VM0101X
- **State license:** MD490154 (Pennsylvania)
- **Sole proprietor:** No
## Practice location
- **Address:** 100 S 2ND ST STE 4B, Harrisburg, PA 17101-2546
- **Phone:** (717) 231-8472 · **Fax:** (717) 231-8490
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 7 organizations under Medicare reassignment (form CMS-855R): Pinnacle Health Medical Services (NPI 1285064626, Harrisburg, PA); Johns Hopkins University (NPI 1831195502, Lutherville, MD); Sinai Hospital Of Baltimore Inc (NPI 1568225282, Eldersburg, MD); University Of Maryland St. Joseph Medical Group, LLC (NPI 1770836785, Towson, MD); Union Hospital Of Cecil County, Inc (NPI 1639920648, Perryville, MD); and 2 more · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 7, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1497989305) · Data from the CMS NPPES public registry.