Kristen Marks, MD
NPI 1255421426 · Infectious Disease Physician · New York, NY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kristen Marks, MD is a Infectious Disease Physician provider in New York, NY (NPI 1255421426).
Provider details
- NPI number
- 1255421426
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 222573 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 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
39 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 25 | $91 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 14 | $152 |
Typical Medicare-allowed amounts for these services range $91–$152 (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 · 13 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Bictegrav/Emtricit/Tenofov Alabrand: Biktarvy | 69 |
| Ritonavir | 32 |
| Emtricitabine/Tenofov Alafenambrand: Descovy | 27 |
| Dolutegravir Sodiumbrand: Tivicay | 27 |
| Darunavir | 21 |
| Valacyclovir Hclbrand: Valacyclovir | 18 |
| Enalapril Maleate | 13 |
| Raltegravir Potassiumbrand: Isentress | 13 |
| Simvastatin | 13 |
| Rilpivirine Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-16
- Last updated
- 2013-03-27
Frequently asked questions
- What is Kristen Marks's NPI number?
- Kristen Marks's National Provider Identifier (NPI) is 1255421426, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kristen Marks's specialty?
- Kristen Marks is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Kristen Marks located?
- Kristen Marks's practice location on file with NPPES is 525 E 68th St Ste J314, New York, NY 10021-4870.
- What is Kristen Marks's phone number?
- The practice phone number listed in the NPPES registry for Kristen Marks is (212) 746-2225.
- Does Kristen Marks accept Medicare?
- Kristen Marks is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kristen Marks's NPI active?
- Yes — Kristen Marks's NPI (1255421426) is active in the NPPES registry as of the last update on 2013-03-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.