Crystal J. Klaahsen, O.D.
Optometrist · Cambridge, MA
Crystal J. Klaahsen, O.D. is an optometrist with a practice address in Cambridge, Massachusetts, and NPI 1528076288, issued on Aug 4, 2006. Check the license (Massachusetts 4567, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Crystal J. Klaahsen
- Credential
- O.D.
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 4567 MA
Self-reported in NPPES; status is on the state search - Practice location
- 2038 Massachusetts Ave, Cambridge, MA 02140
- Phone
- (617) 864-3147
- Enumerated
- Aug 4, 2006
- Record last updated
- Nov 14, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (617) 864-4994
- Medicare enrollment
- Enrolled (PECOS I20061120000437); accepts Medicare assignment
- Medical or professional school
- New England College Of Optometry, 2006
- Entity
- Type 1 · individual
8 nearest optometrist records → All 1,501 in Massachusetts → Look up another NPI →
Also registered at 2038 Massachusetts Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sandra Payton, O.D.Optometrist1851549224
Verify Crystal J. Klaahsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 4567Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average optometrist in 2024
51 Medicare Part D claims for 20 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 53% of claims.
Most prescribed
- Latanoprost14 claims
- Tyrvaya14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $205.01
6 payments; by number, the most common kind was food and beverage; the largest payer was Dompe US, Inc. The 34,453 providers of this specialty with any payment received $769.99 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Porter Square Eye Associates IncCambridge, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Crystal J. Klaahsen among 1,501 optometrist records in Massachusetts
Crystal J. Klaahsen, O.D. is one of 1,501 optometrist records with a practice address in Massachusetts. 66% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 56% newer
- In a Medicare fileYes · 66% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2006 · median 2008 among the 933 with a school on file
- Record last updated2011 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 152W00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Optometrist providers in Massachusetts
There are 1,501 optometrist records in Massachusetts.
All 1,501 in Massachusetts → Every provider in Cambridge → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Belqes Galaal, ODNorth Cambridge, MA 021401942965975
- Cheryl Depalo Jost, ODCambridge, MA 021401083719371
- Sandra Payton, O.D.Cambridge, MA 021401851549224
- Simin Rajwany, ODCambridge, MA 021401306778329
- Margot Seligman, O.D.Cambridge, MA 021401528120524
- Grace Anosike, ODCambridge, MA 021411790720233
- Karen Frizzell Lewis, ODCambridge, MA 021391356414205
- Robert Gross, ODCambridge, MA 021391245204403
Common questions
What is Crystal J. Klaahsen, O.D.'s NPI number?
Crystal J. Klaahsen, O.D.'s National Provider Identifier (NPI) is 1528076288, issued on Aug 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Crystal J. Klaahsen, O.D. located?
The NPPES record lists a practice address at 2038 Massachusetts Ave, Cambridge, MA, 02140. Phone: (617) 864-3147. Providers update this record themselves, so call before visiting.
How can I verify Crystal J. Klaahsen, O.D.'s license?
NPPES lists Massachusetts license number 4567, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Crystal J. Klaahsen, O.D. prescribe under Medicare Part D?
In 2024, Crystal J. Klaahsen, O.D. had 51 Medicare Part D claims for 20 beneficiaries; the average among optometrist prescribers was 277. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.