COMPOSITE REWRITE BY CLAUDE,
The Lab Date of Service Rule, Explained Plainly
A guide for hospital and laboratory billing staff, working from 42 CFR 414.510
CLAUDE (version 2)
For most laboratory tests, Medicare's date of service is the date the specimen was collected. Testing the sample later, sending it to another laboratory, or issuing the report later does not change that date. A different date applies only when the test meets one of the specific exceptions in 42 CFR 414.510.
The rule covers clinical laboratory tests and the technical component of pathology services. It does not set the date of service for the pathologist's professional interpretation. [§414.510(a)]
Why the date matters
Lab tests rarely happen on a single day. A test may be ordered on Monday, collected on Tuesday, stored for three weeks, run on a Thursday, and reported the following Monday. Medicare picks one of those dates, and that choice decides who bills.
If the date of service falls within a hospital stay or a hospital outpatient encounter, the test generally belongs to the hospital's claim. The hospital bills Medicare, and the performing laboratory looks to the hospital for payment. If the date falls after the encounter, the performing laboratory generally bills Medicare directly under the Clinical Laboratory Fee Schedule. The date also decides which year's fee schedule applies and whether the patient was in fee-for-service Medicare or Medicare Advantage on that day. A wrong date means the wrong entity bills, or the claim is priced or routed incorrectly.
The rule has one default and a short list of exceptions. They are covered below in the order the regulation gives them.
The default: the collection date
The date of service is the date the specimen was collected. [§414.510(a)] This covers most tests: a blood draw in a physician's office, a urine sample at a patient service center, a biopsy processed and read the same week. For example, if blood is collected on June 3 and an independent laboratory tests it on June 5, the date of service is June 3. Hospital specimens start from the same rule, and where the testing lab is located does not affect the date.
Exception 1: Collection spanning two days
If collection spans two calendar days, the date of service is the date collection ended. A 24-hour urine collection that begins June 3 and ends June 4 has a June 4 date of service. [§414.510(b)(1)]
Exception 2: Stored specimens
This exception is what people usually mean by "the 14-day rule." The outcome depends on how long the specimen was stored before testing.
Stored 30 calendar days or fewer. The date of service is the date the test was performed, but only if all five of these conditions are met: [§414.510(b)(2)(i)]
- The test was ordered by the patient's physician at least 14 days following the date of the patient's discharge from the hospital.
- The specimen was collected while the patient was undergoing a hospital surgical procedure.
- It would be medically inappropriate to have collected the sample other than during the hospital procedure for which the patient was admitted.
- The results of the test do not guide treatment provided during the hospital stay.
- The test was reasonable and medically necessary for the treatment of an illness.
If any one of these conditions fails, the exception does not apply. The date of service reverts to the collection date, which falls within the hospital stay, and the hospital bills. Meeting the 14-day order requirement is only one of the five conditions. In practice, though, it is usually the one that decides the case. The 14 days run from discharge to the physician's order. Waiting longer before performing or billing the test does not make an earlier order qualify. CMS has long applied this exception to hospital outpatient surgical specimens as well as inpatient ones, with outpatient discharge serving as the starting point.
For example, tissue is collected during inpatient surgery on June 1 and the patient is discharged June 5. The physician orders a test on June 19, exactly 14 days after discharge, and the laboratory performs it June 22. The specimen was stored less than 30 days. If the other four conditions are met, the date of service is June 22 and the laboratory bills. If the physician had ordered the test on June 12, the date of service would be June 1 and the hospital would bill.
Stored more than 30 calendar days. The specimen is considered archived, and the date of service is the date the specimen was obtained from storage. [§414.510(b)(2)(ii)] This provision has no 14-day requirement and no other conditions. Note that 30 days exactly is not "more than 30." Also note that retrieval and testing are separate events. If a tumor block from an inpatient surgery is stored for six months, retrieved on December 4, and tested on December 7, the date of service is December 4. Billing staff therefore need both dates.
Exception 3: Chemotherapy sensitivity tests on live tissue
This is a narrow category for tests, identified by CMS through program instructions, that use fresh tissue to measure how tumor cells respond to specific chemotherapy drugs. [§414.510(b)(3)–(4)] It does not cover every test used to choose cancer treatment. For these tests the date of service is the date performed if the same five conditions apply, with one change: the 14-day clock runs from discharge to the decision about which chemotherapy agents to test, not to the order. Most billing staff will rarely encounter this exception.
Exception 4: Advanced tests on hospital outpatients
This exception, added in 2018 and broadened in later rulemaking, is the one that matters most for genomic and precision-medicine testing. It covers four categories of tests: [§414.510(b)(5)]
- molecular pathology tests performed by a laboratory other than a blood bank or blood center;
- ADLTs designated under paragraph (1) of the ADLT definition in §414.502 (the multi-biomarker, algorithm-based kind, not the FDA-cleared kind under paragraph (2));
- cancer-related protein-based MAAAs; and
- the test described by CPT 81490.
For these tests the date of service is the date the test was performed if all five of these conditions are met:
- The test was performed following the patient's discharge from the hospital outpatient department.
- The specimen was collected from a hospital outpatient during a hospital outpatient encounter, as both terms are defined in 42 CFR 410.2.
- It was medically appropriate to have collected the sample during that encounter.
- The results of the test do not guide treatment provided during that encounter.
- The test was reasonable and medically necessary for the treatment of an illness.
People often miss two points about this exception.
First, there is no 14-day waiting period. The regulation does not require the physician to wait until after discharge to order the test. It requires only that the test be performed after discharge. For example, a patient has an outpatient biopsy and is discharged on June 3. A listed molecular test is ordered the same day and performed June 6. The date of service is June 6, and the performing laboratory bills Medicare directly. CMS's own explanation states that the test is separated from the hospital outpatient encounter, and the laboratory does not bill the hospital. Ending the practice of making hospitals bill for expensive single-source tests they had no part in was the reason for this exception.
Second, it applies to outpatients only. Discharging an inpatient and sending the specimen to an outside laboratory does not make it an outpatient specimen. Inpatient specimens go back to Exception 2, including its 14-day requirement.
Whether a test qualifies is a question of category, not marketing. A test is not covered just because someone calls it "advanced." CMS publishes and periodically updates a list of qualifying HCPCS codes. Check the list instead of guessing whether a particular PLA code is on it.
Putting it together
For any claim, work through these questions in order:
- Was the specimen stored more than 30 calendar days before testing? If so, the date of service is the date it was retrieved from storage.
- Was the specimen collected during a hospital inpatient stay or a hospital outpatient encounter? If not, the date of service is the collection date (or, for a two-day collection, the end date), and you are done.
- Is it a hospital outpatient specimen, and is the test on the CMS list? If so, and all five Exception 4 conditions are met, the date of service is the date performed. The order date does not matter.
- Was the specimen collected during a hospital surgical procedure, and was the test ordered at least 14 days after discharge? If so, and the other four Exception 2 conditions are met, the date of service is the date performed. For live-tissue chemotherapy sensitivity tests, measure the 14 days to the drug-selection decision instead.
- If none of these apply, the date of service is the collection date, and the test belongs on the hospital's claim.
Three common misreadings
"The rule is collection date unless the test is ordered 14 days after discharge." This shorthand is common and incomplete. The 14-day order requirement is one of five conditions in a single exception. Meeting it does nothing if any of the other four conditions fails, and it is irrelevant to Exception 4.
Mixing up the 14-day clock and the 30-day clock. These clocks measure different things. The 14-day clock runs from discharge to the physician's order. The 30-day clock runs from collection to testing and determines whether a specimen is archived. Some published flowcharts merge them into a single timeline, such as "ordered within 15–29 days of discharge." That timeline is not in the regulation, and it produces wrong answers.
Applying the 14-day wait to outpatient molecular tests. For listed tests on hospital outpatients, Exception 4 has no requirement about when the test is ordered. Checking the 14-day rule first sends claims to the hospital that belong to the laboratory.
A note on "date performed"
Section 414.510 uses the phrase "the date the test was performed" but does not define it. Some contractors, including Wellpoint Federal (J6/JK), have said they treat the report date as the date performed. That is a workable convention, but it is contractor guidance, not regulation, so confirm how your own MAC handles it. Record the testing date and the report date separately.
Documentation and limits
Hospital and laboratory staff need the same facts: collection date and setting, discharge date, order date (or drug-selection date), test category, storage and retrieval dates where relevant, and testing date. When you rely on an exception, the record should also support its clinical conditions. The pathology or laboratory report is usually where an auditor will look for these facts.
Two final cautions. When an exception applies, the date it sets is mandatory. You cannot pick whichever date gives the preferred billing result. And a correct date of service does not by itself establish coverage, separate payment, or a particular entity's right to submit the claim. Those questions come next, under their own rules.
Sources: 42 CFR §414.510 (eCFR) · CMS, Laboratory Date of Service Policy and qualifying test code list
A few notes on this version. I avoided giving a date for the later rulemaking ("broadened in later rulemaking") because I couldn't confirm when the MAAA and 81490 additions took effect; if you know the rule years offhand, add them back. I replaced the "CMS and several MACs" attribution with "this shorthand is common." And I moved the archive question to the front of the sequence, because §414.510(b)(2)(ii) isn't limited to hospital specimens.
The question would be, what does a person think of #1 veresus #6.
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