Karen Darkenwald, O.D.
NPI 1124177183 · Optometrist · Sacramento, CA
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Darkenwald, O.D. is a Optometrist provider in Sacramento, CA (NPI 1124177183).
Provider details
- NPI number
- 1124177183
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- O.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 8449T (CA)
Specialties & taxonomies
Eye and Vision Services Providers
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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cyclosporine | 25 | 12 |
| Erythromycin Basebrand: Erythromycin | 22 | 15 |
| Neomycin/Polymyxin B/Dexamethabrand: Neomycin-Polymyxin-Dexameth | 16 | 16 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-09
- Last updated
- 2022-01-27
- Certified
- 2022-01-27
Frequently asked questions
- What is Karen Darkenwald's NPI number?
- Karen Darkenwald's National Provider Identifier (NPI) is 1124177183, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Darkenwald's specialty?
- Karen Darkenwald is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Karen Darkenwald located?
- Karen Darkenwald's practice location on file with NPPES is 1650 Response Rd, Sacramento, CA 95815-4807.
- What is Karen Darkenwald's phone number?
- The practice phone number listed in the NPPES registry for Karen Darkenwald is (916) 614-4015.
- Does Karen Darkenwald accept Medicare?
- Karen Darkenwald is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Darkenwald's NPI active?
- Yes — Karen Darkenwald's NPI (1124177183) is active in the NPPES registry as of the last update on 2022-01-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.