John Ross Knowlton, PT, DPT
Physical Therapist · Columbia, MD
John Ross Knowlton, PT, DPT is a physical therapist with a practice address in Columbia, Maryland, and NPI 1316537566, issued on Jan 21, 2021. Check the license (Maryland 28257, as entered in NPPES) with the Maryland board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- John Ross Knowlton
- Credential
- PT, DPT
- Primary taxonomy
- Physical Therapist 225100000X
- License number
- 28257 MD
Self-reported in NPPES; status is on the state search - Practice location
- 9030 State Route 108 Ste B, Columbia, MD 21045
- Phone
- (410) 989-3833
- Enumerated
- Jan 21, 2021
- Record last updated
- Jan 21, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20220214002383); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physical therapist records → All 6,177 in Maryland → Look up another NPI →
Also registered at 9030 State Route 108 Ste B
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lucas Chang, PT, DPT, CSCSOrthopedic Physical Therapist1053970335
- Darren Joseph, DPTPhysical Therapist1740647262
- Paul Kirkpatrick, DPTPhysical Therapist1285454140
- William Layton, DPTPhysical Therapist1972096790
Verify John Ross Knowlton in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license 28257Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through 2 group practices
- Centers For Advanced Orthopaedics LLCWashington, DC
- Homecare Rehab And Nursing LLCFrederick, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Ross Knowlton among 6,177 physical therapist records in Maryland
John Ross Knowlton, PT, DPT is one of 6,177 physical therapist records with a practice address in Maryland. 36% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 79% of them.
- NPI issued2021 · 79% of these records are older, 17% newer
- In a Medicare fileYes · 36% of these records are
- In the CMS Doctors and Clinicians fileYes · 38% of these records are
- Graduated2020 · median 2015 among the 2,359 with a school on file
- Record last updated2021 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 225100000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
222 physical therapist records list a practice address in Columbia
They are 222 of the 6,690 NPPES records with a practice address in Columbia, and 6,177 physical therapist records in Maryland.
All 6,177 in Maryland → Every provider in Columbia → Physical Therapist nationwide →
The 8 physical therapist records with the nearest ZIP codes
- John Battinelli, PTColumbia, MD 210451386784056
- John Broadway, PTColumbia, MD 210451124099668
- Donabele Cadatal-Abellana, LPTColumbia, MD 210451649368234
- Krisna Nikka Colburn, M.P.T.Columbia, MD 210451457365744
- Julie Eberly, PTColumbia, MD 210451811023393
- Jared Goldstein, MPTColumbia, MD 210451184778474
- Kristy Green, MPTColumbia, MD 210451558401224
- Karen Johnson, P.T.Columbia, MD 210451558403667
Common questions
What is John Ross Knowlton, PT, DPT's NPI number?
John Ross Knowlton, PT, DPT's National Provider Identifier (NPI) is 1316537566, issued on Jan 21, 2021. An NPI identifies a provider in billing; it is not a license.
Where is John Ross Knowlton, PT, DPT located?
The NPPES record lists a practice address at 9030 State Route 108 Ste B, Columbia, MD, 21045. Phone: (410) 989-3833. Providers update this record themselves, so call before visiting.
How can I verify John Ross Knowlton, PT, DPT's license?
NPPES lists Maryland license number 28257, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.