Karla Wallen, NP-C
NPI 1598420739 · Family Nurse Practitioner · Longmont, CO
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karla Wallen, NP-C is a Family Nurse Practitioner provider in Longmont, CO (NPI 1598420739).
Provider details
- NPI number
- 1598420739
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP-C
- Sex
- Female
- Sole proprietor
- No
- License
- APN.0997083-NP (CO)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
4 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
181 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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 does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 79 | $98 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 39 | $9 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 27 | $74 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 24 | $57 |
| Administration of Influenza Virus VaccineG0008 | 12 | $33 |
Typical Medicare-allowed amounts for these services range $9–$98 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 41 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 94 | 27 |
| Lisinopril | 89 | 23 |
| Levothyroxine Sodium | 87 | 22 |
| Amlodipine Besylate | 65 | 15 |
| Metformin Hclbrand: Metformin Hcl Er | 46 | 15 |
| Sertraline Hcl | 34 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-11-02
- Last updated
- 2021-12-15
- Certified
- 2021-12-15
Frequently asked questions
- What is Karla Wallen's NPI number?
- Karla Wallen's National Provider Identifier (NPI) is 1598420739, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karla Wallen's specialty?
- Karla Wallen is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Karla Wallen located?
- Karla Wallen's practice location on file with NPPES is 2101 Ken Pratt Blvd Ste 200, Longmont, CO 80501-6568.
- What is Karla Wallen's phone number?
- The practice phone number listed in the NPPES registry for Karla Wallen is (303) 649-3500.
- Does Karla Wallen accept Medicare?
- Karla Wallen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karla Wallen's NPI active?
- Yes — Karla Wallen's NPI (1598420739) is active in the NPPES registry as of the last update on 2021-12-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.