PPM Certificate: Provider-Performed Microscopy

The certificate is built around the person at the microscope. A PPM procedure must be "personally performed", during the patient's visit, by one of three practitioners (§ 493.19(b)(1)):

• A physician, on a specimen from their own patient or a patient of their group practice.
• A midlevel practitioner, under a physician's supervision or in independent practice where the state allows it. CDC's PPM booklet names them: nurse midwife, nurse practitioner, physician assistant.
• A dentist, on a specimen from their own patient or a patient of their group dental practice.

The microscope is "limited to bright-field or phase-contrast microscopy" (§ 493.19(b)(3)). The director must be a physician, a dentist or a midlevel practitioner licensed to practice independently in the state, with a state lab director licence where the state requires one (§ 493.1357), and may direct no more than five labs (§ 493.1359(a)). Each tester needs a state licence where required and one of the same three roles (§ 493.1363). How these roles sit beside the moderate and high complexity ones: CLIA personnel requirements.

CMS's fee schedule (updated 2024) lists $297 for a certificate for PPM procedures, paid every two years, with no survey fee. That is $49 more per cycle than a Certificate of Waiver at $248. A revised PPM certificate is $150 and a replacement $75.

The application is Form CMS-116 to your State Agency, with "PPM (Complete Sections I-VII and IX-X)" ticked; Section VII is where the PPM procedures go. CMS's apply page groups PPM with nonwaived testing: the director must meet CLIA's qualifications, and you send proof with the application. The certificate is valid "for a period of no more than 2 years" (§ 493.47(e)) and renews on an emailed invoice (CLIA certificate renewal). Once issued, it shows in CMS's lookup under the type "Microscopy - PPMP" (CLIA lookup).

CMS fee schedule, updated 2024, read 2026-10-23. Box by box: CMS-116 form: how to fill it out.

PPM is a nonwaived certificate in miniature. The lab is held to the certificate rules plus subparts H, J, K and M(§ 493.47(c)): proficiency testing, facility administration, the quality system and personnel.

Quality control

The procedures qualify for PPM partly because control material that covers the whole process does not exist. CDC's PPM booklet expects practitioners to "follow the manufacturers' directions for QC or follow good laboratory practices", to document all QC including errors and corrective action, and recommends two levels of controls, where available, each day of testing, with each new shipment of stains or reagents, each lot change and each new operator. Some of its advice goes beyond the rule, and it says so. A PPM lab may also use an IQCP (when IQCP replaces the default).

Accuracy checks instead of required PT

None of the nine procedures is a regulated PT analyte, so the lab must verify each one's accuracy "at least twice annually" (§ 493.1236(c)) and document it. CDC notes that several approved PT programs offer voluntary PPM modules that satisfy the check, and that a lab which enrols is bound by every PT rule, including the ban on referral. The check is explained in tests with no PT program; the programs are in the CMS-approved PT program list.

Competency

The director evaluates every tester (§ 493.1359(c)) with five procedures: direct observation, monitoring the recording and reporting of results, review of results or worksheets, blind or PT samples, and problem solving. CMS's competency brochure: "PPM competency assessments only need to include five of the six procedures", because instrument maintenance checks do not apply. The director may delegate single procedures in writing to another qualified PPM tester. Where the director is the only one testing, CMS asks for "a minimum proficiency level", documented, for example through PT samples or another entity reviewing the work. The full method is in CLIA competency assessment.

Not routinely. A PPM lab is inspected only under the general inspection rules (§ 493.47(c)(3)). CMS's MLN fact sheet names the triggers: a complaint, testing beyond the certificate, a risk of harm from inaccurate testing, or "a need to collect PPM procedure information". CMS's survey manual adds that a PPM lab "may be included in an inspection sample of non-waived laboratories" (SOM § 6006.3). Keep the QC log, the accuracy checks and the competency files where a surveyor could see them on any working day.

• Someone else reads the slide. A medical assistant, nurse (other than a midlevel practitioner) or lab tech cannot perform PPM. The same exam is then plain moderate complexity testing, which needs a registration certificate and then compliance or accreditation.
• The slide waits. PPM is done "during the patient's visit". Specimens batched for later fall outside it.
• You add an analyzer. Any other moderate or high complexity test needs notice before the first patient result (§ 493.53(a)) and a new CMS-116 for compliance or accreditation.
• You stopped the microscopy. A lab that runs only waived tests can move to a Certificate of Waiver on a new CMS-116; the CMS brochure lists the change from PPM to CoW.

An accredited lab that cuts back to PPM procedures alone may move down to a PPM certificate, and cannot keep its Certificate of Accreditation (SOM § 6014).