Richard Gruen, M.D.
NPI 1043221088 · Ophthalmology Physician · Owings Mills, MD
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Richard Gruen, M.D. is a Ophthalmology Physician provider in Owings Mills, MD (NPI 1043221088).
Provider details
- NPI number
- 1043221088
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- D0025907 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,587 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 997 | $133 |
| Imaging of Optic Nerve92133 | 345 | $36 |
| Photography of the Retina92250 | 273 | $38 |
| Exam of Visual Field With Extended Testing92083 | 248 | $66 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 239 | $95 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 132 | $173 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 741 | 211 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 319 | 93 |
| Brimonidine Tartrate | 89 | 32 |
| Prednisolone Acetate | 76 | 57 |
| Pilocarpine Hcl | 69 | 21 |
| Timolol Maleate | 65 | 25 |
| Dorzolamide Hcl | 65 | 24 |
| Tobramycin/Dexamethasone |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$256 across 5 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-11
- Last updated
- 2007-07-08
Frequently asked questions
- What is Richard Gruen's NPI number?
- Richard Gruen's National Provider Identifier (NPI) is 1043221088, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Richard Gruen's specialty?
- Richard Gruen is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Richard Gruen located?
- Richard Gruen's practice location on file with NPPES is 10 Crossroads Drive, Owings Mills, MD 21117.
- What is Richard Gruen's phone number?
- The practice phone number listed in the NPPES registry for Richard Gruen is (410) 654-5700.
- Does Richard Gruen accept Medicare?
- Richard Gruen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Richard Gruen's NPI active?
- Yes — Richard Gruen's NPI (1043221088) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.