Karen Ratner, MD
NPI 1740391739 · Internal Medicine Physician · Littleton, CO
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Ratner, MD is a Internal Medicine Physician provider in Littleton, CO (NPI 1740391739).
Provider details
- NPI number
- 1740391739
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 20266 (CO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-31
- Last updated
- 2015-07-21
Frequently asked questions
- What is Karen Ratner's NPI number?
- Karen Ratner's National Provider Identifier (NPI) is 1740391739, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Ratner's specialty?
- Karen Ratner is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Ratner located?
- Karen Ratner's practice location on file with NPPES is 7750 S Broadway, Littleton, CO 80122-2623.
- What is Karen Ratner's phone number?
- The practice phone number listed in the NPPES registry for Karen Ratner is (303) 347-9897.
- Does Karen Ratner accept Medicare?
- Karen Ratner is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Ratner's NPI active?
- Yes — Karen Ratner's NPI (1740391739) is active in the NPPES registry as of the last update on 2015-07-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.