Isabel Koelsch, M.D.
Dermatology Physician · Longmont, CO
Isabel Koelsch, M.D. is a dermatology physician with a practice address in Longmont, Colorado, and NPI 1801930110, issued on Feb 19, 2007. Check the license (Colorado 23406, as entered in NPPES) on the Colorado Medical Board; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Isabel Koelsch
- Credential
- M.D.
- Primary taxonomy
- Dermatology Physician 207N00000X
- License number
- 23406 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1850 Mountain View Ave, Longmont, CO 80501
- Phone
- (303) 776-1500
- Enumerated
- Feb 19, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (303) 772-2995
- Medicaid ID
- 01234061 CO
- Entity
- Type 1 · individual
8 nearest dermatology physician records → All 305 in Colorado → Look up another NPI →
Also registered at 1850 Mountain View Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alycia Barland, MDInternal Medicine Physician1396183356
- Kelsey Schuppert, PA-CPhysician Assistant1699492934
- Jacob Whitsitt, M.D.Dermatology Physician1508250846
Verify Isabel Koelsch in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 23406Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Isabel Koelsch among 305 dermatology physician records in Colorado
Isabel Koelsch, M.D. is one of 305 dermatology physician records with a practice address in Colorado. 86% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 36% of them.
- NPI issued2007 · 36% of these records are older, 48% newer
- In a Medicare fileNo · 86% of these records are
- In the CMS Doctors and Clinicians fileNo · 78% of these records are
- Record last updated2007 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207N00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Dermatology Physician providers in Colorado
There are 305 dermatology physician records in Colorado. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 305 in Colorado → Every provider in Longmont → Dermatology Physician nationwide →
The 8 dermatology physician records with the nearest ZIP codes
- Peter Bachmann, MDLongmont, CO 805011992702161
- Kristin Baird, M.D.Longmont, CO 805011013900539
- Scott Clark, MDLongmont, CO 805011366447740
- John Fueston, M.D.Longmont, CO 805011023000692
- Allison Morrison, MDLongmont, CO 805011063613826
- Jacob Whitsitt, M.D.Longmont, CO 805011508250846
- Jessica Yoon, M.D.Longmont, CO 805011831352418
- Randall MaharryEstes Park, CO 805171730592320
Common questions
What is Isabel Koelsch, M.D.'s NPI number?
Isabel Koelsch, M.D.'s National Provider Identifier (NPI) is 1801930110, issued on Feb 19, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Isabel Koelsch, M.D. located?
The NPPES record lists a practice address at 1850 Mountain View Ave, Longmont, CO, 80501. Phone: (303) 776-1500. Providers update this record themselves, so call before visiting.
How can I verify Isabel Koelsch, M.D.'s license?
NPPES lists Colorado license number 23406, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.